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app","/dl/assets/logos/un-iqair-airvisual-app-logo.svg",{"_598":619,"_600":620},"/dl/assets/nav/world-air-quality/nav-world-air-quality-app.webp","/dl/assets/nav/world-air-quality/nav_app_img.webp",{"_584":622,"_586":587},"/air-quality-monitors/air-quality-app",{"_69":624,"_580":625,"_22":626,"_596":627,"_582":630},"cityRanking","Live AQI⁺ City Ranking","See the most polluted cities around the world",{"_598":628,"_600":629},"/dl/assets/nav/world-air-quality/nav-world-air-quality-city-ranking.webp","/dl/assets/nav/world-air-quality/nav_ranking_img.webp",{"_584":631,"_586":587},"/world-air-quality-ranking",{"_69":633,"_580":634,"_22":635,"_596":636,"_582":638,"_640":641},"joinMovement","Join the movement","Set up a monitor and join our global community of contributors increasing access to air quality data.",{"_598":637,"_600":637},"/dl/assets/nav/world-air-quality/community-nav.webp",{"_584":639,"_586":587},"/air-quality-community","excludeRegions",[642],"CN",{"_69":644,"_580":645,"_22":646,"_596":647,"_582":649,"_640":651},"cleanAirDirectory","Clean Air Directory","Find indoor locations with superior air quality",{"_598":648,"_600":648},"/dl/assets/nav/world-air-quality/iqair-cleanzone-nav@2x.webp",{"_584":650,"_586":587},"/clean-air-directory?page=1&perPage=15",[652,653,654],"CA","US","MX","aside",{"_657":658,"_711":712},"articles",[659,673,683,692,702],{"_69":660,"_580":661,"_662":663,"_664":665,"_666":667,"_668":669,"_596":670},"gid://shopify/Article/999032357238","Wildfire Map Spotlight: Bronco Fire, Arizona","excerpt","Find out more about the Bronco Fire in Arizona, its impact on air quality, and current firefighting efforts.","content","What is the name and location of the wildfire? As of August 11, 2025, the Bronco Fire is burning on the San Carlos Apache Reservation in Arizona. The fire is situated northeast of Phillips Park Tank in Hilltop, approximately 30 miles northeast of the community of San Carlos, and is moving eastward through brushy, steep terrain (1). This wildfire is one of two major blazes in the region, occurring less than 10 miles from the Indian Creek Fire. Which cities or areas are affected by the Bronco Fire? The cities and areas affected by the Bronco Fire include: Bylas Peridot San Carlos Smoke from the fire has created air-quality concerns for these communities, prompting health advisories for sensitive groups (2). What is the current containment status of the Bronco Fire? As of August 11, 2025, the Bronco Fire has burned approximately 17,997 acres and is 0% contained (3). Firefighting crews are focusing on securing the south side of the fire using the 100 and 1400 roads, while also working along the Y2 Road to prevent the blaze from advancing northward. Extreme drought and dry fuel conditions, compounded by gusty winds, continue to challenge suppression efforts. Are there any evacuation orders or alerts in place? While no formal evacuation orders have been issued specifically for the Bronco Fire, authorities have issued health advisories for smoke impacts in the Bylas and Peridot areas. Residents, particularly the elderly and individuals with respiratory conditions, are advised to remain indoors when possible. Community meetings have been held to keep residents informed about fire status, weather conditions, and emergency preparedness measures. How can I protect myself from wildfire smoke? Always plan ahead to protect yourself from wildfire smoke. Get a free air quality app for real-time air quality alerts and forecasts. Shut doors and windows and set the HVAC to recirculate mode. Run a high-performance air purifier to filter wildfire smoke. Contribute to your community’s outdoor air quality data. Stay indoors; if you do need to go outdoors, wear a KN95/FFP2 mask.","handle","wildfire-map-spotlight-bronco-fire-arizona","publishedAt","2025-08-11T11:54:25Z",{"_92":671,"_89":672},"https://cdn.shopify.com/s/files/1/0677/4059/8571/articles/Bronco_Fire_Desktop_ecea470f-6c8a-4c26-adf6-1750a9b15b8a.jpg?v=1754914188","Smoke rising from forest fire in mountains",{"_69":674,"_580":675,"_662":676,"_664":677,"_666":678,"_668":679,"_596":680},"gid://shopify/Article/999028359542","Middle East Air Quality Spotlight: Jerusalem among top 10 most polluted cities in the world","Jerusalem, Israel's historic capital, faces critical air pollution with AQI levels very unhealthy, topping global rankings for major cities. Elevated PM levels threaten health, prompting urgent adoption of air purifiers and masks to protect residents from severe risks. Learn about causes, affected areas, and protection tips.","Is the air quality good in Jerusalem? No, as of August 11, 2025, the air quality in Jerusalem, Israel is very unhealthy. The current AQI levels are far above normal, with PM2.5 at and PM10 dominating. This poses immediate risks like respiratory distress, aggravated heart conditions, and reduced lung function, especially for vulnerable groups. Recommendations include staying indoors, sealing homes, using masks outdoors, and employing air purifiers to mitigate indoor pollution exposure. For a more detailed look, see Jerusalem's air quality map. Jerusalem, Israel ranked as the most polluted major city on August 11. Source: IQAir. Why is there an air quality alert in Jerusalem? The alert is due to critically high particulate matter levels penetrating lungs and bloodstream, increasing chances of strokes, heart attacks, and chronic illnesses. Extreme heat and arid conditions hinder pollutant dispersal, amplifying hazards for extended outdoor exposure. Hourly air quality forecast for Jerusalem, Israel on August 11. Source: IQAir. Air quality map of Jerusalem, Israel on August 11. Source: IQAir. What is causing poor air quality in Jerusalem? Key causes include desert dust from nearby regions and North Africa, vehicular emissions from diesel traffic and buses, industrial activities, and fossil fuel combustion in power plants. Urban growth and proximity to deserts exacerbate dust storms and ozone formation (1). Are there any evacuation orders or alerts in place? Health alerts advise limiting outdoor activities, particularly for sensitive individuals, but no evacuation orders are issued, as the pollution, though severe, does not require relocation. How can I protect myself from poor air quality? Get a free air quality app for real-time air quality alerts and forecasts. Shut doors and windows and set the HVAC to recirculate mode. Contribute to your community’s outdoor air quality data. Stay indoors when air quality is poor; if you do need to go outdoors, wear a KN95/FFP2 mask. Run a high-performance air purifier to filter particles, gases, and other pollutants.","middle-east-air-quality-alert","2025-08-11T05:05:53Z",{"_92":681,"_89":682},"https://cdn.shopify.com/s/files/1/0677/4059/8571/articles/PollutedCity2Desktop_6720c5bc-fc73-4c8b-a743-8d5a7a6a1d89.jpg?v=1754892032","Polluted City",{"_69":684,"_580":685,"_662":686,"_664":687,"_666":688,"_668":689,"_596":690},"gid://shopify/Article/999027474806","Middle East Air Quality Spotlight: Riyadh among top 10 most polluted cities in the world","Riyadh, the capital of Saudi Arabia, is grappling with severe air pollution, ranking as the most polluted major city globally. High PM2.5 levels pose immediate health threats, urging residents to adopt protective measures like air purifiers to safeguard their well being. Learn about causes, affected areas, and protection tips.","Is the air quality good in Riyadh? No, as of August 10, 2025, the air quality in Riyadh is poor. The current AQI classified as unhealthy, with PM2.5 concentrations dominating the pollution. This level can exacerbate respiratory issues, heart conditions, and other health problems, particularly for children, the elderly, and those with pre-existing ailments. Health recommendations include avoiding outdoor activities, sealing windows against polluted air, wearing masks when outside, and using air purifiers to reduce indoor exposure. For a more detailed look, see Riyadh's air quality map. Riyadh, Saudi Arabia ranked as the most polluted major city on August 10. Source: IQAir. Why is there an air quality alert in Riyadh? The air quality alert in Riyadh stems from dangerously high PM2.5 levels, which penetrate deep into the lungs and bloodstream, heightening risks of cardiovascular and respiratory diseases. Extreme heat, low humidity, and wind worsen pollutant dispersion, making the environment hazardous for prolonged exposure. Hourly air quality forecast for Riyadh, Saudi Arabia on August 10. Source: IQAir Air quality map of Riyadh, Saudi Arabia on August 10. Source: IQAir. What is causing poor air quality in Riyadh? Poor air quality in Riyadh is driven by desert dust from frequent storms, vehicular and industrial emissions from rapid urbanization and fossil fuel reliance, and sandstorms that elevate particulate matter. Additional factors include traffic congestion and petrochemical activities. Are there any evacuation orders or alerts in place? Health alerts are active, advising vulnerable groups to limit outdoor time and take protective steps due to unhealthy conditions, but no evacuation orders exist as pollution, while severe, does not warrant mass relocation. How can I protect myself from poor air quality? Get a free air quality app for real-time air quality alerts and forecasts. Shut doors and windows and set the HVAC to recirculate mode. Contribute to your community’s outdoor air quality data. Stay indoors when air quality is poor; if you do need to go outdoors, wear a KN95/FFP2 mask. Run a high-performance air purifier to filter particles, gases, and other pollutants.","middle-east-air-quality-spotlight","2025-08-10T15:29:14Z",{"_92":691,"_89":-5},"https://cdn.shopify.com/s/files/1/0677/4059/8571/articles/PollutedCity3Desktop_12d0a03d-1ded-4515-ac58-9e8dfa406068.jpg?v=1754840414",{"_69":693,"_580":694,"_662":695,"_664":696,"_666":697,"_668":698,"_596":699},"gid://shopify/Article/999026884982","Heatwave Map Spotlight: California, USA","Find out more about the heatwave in the Southwest US.","Why is there a heatwave in California? As of August 10, 2025, a powerful high-pressure system, known as a heat dome, is fueling the U.S. Southwest heatwave, trapping intense heat and driving clear skies with record-shattering temperatures, intensified by persistent dry conditions (7). This phenomenon is exacerbated by dry conditions and climatic patterns, contributing to record-breaking heat. Which cities are impacted? The heatwave affects multiple cities across the Southwest US, including: Los Angeles, California Fresno, California Palm Springs, California Las Vegas, Nevada Phoenix, Arizona Tucson, Arizona Albuquerque, New Mexico Dallas, Texas Medford, Oregon How long will the heatwave last? The heatwave began building around August 6, 2025, with peak temperatures occurring on August 7 and 8, 2025. It is expected to continue through the weekend, with some areas experiencing elevated heat until Monday, August 11, 2025, before a gradual cooldown begins (3). Overall, the duration of triple-digit temperatures in many affected areas spans approximately four to five days, marking the first significant heatwave of the summer in parts of Northern California (8). An update indicates that while the extreme heat in the desert Southwest may lessen slightly over the weekend, widespread heat could return to other parts of the country later next week (1). Are there any alerts in place? Authorities have issued several alerts due to the heatwave and associated risks, focusing on public safety and prevention of heat-related illnesses. Red flag warnings for critical fire weather conditions are active across five western states: Oregon, Utah, Colorado, Wyoming, and New Mexico, due to low humidity and high winds that could lead to rapid fire spread. An elevated fire weather warning is also in place for Santa Barbara County, California, through Saturday, increasing the risk of wildfires in inland areas (6). Additionally, an ozone advisory has been issued for Southern California, warning of unhealthy air quality expected in inland communities, particularly in the San Bernardino Mountains and Valley. This poor air quality, driven by higher temperatures leading to ozone formation, is especially dangerous for sensitive groups like children, older adults, and those with respiratory issues (4).","heatwave-map-spotlight-california-usa","2025-08-10T11:22:26Z",{"_92":700,"_89":701},"https://cdn.shopify.com/s/files/1/0677/4059/8571/articles/CA-Heatwave_Desk_a32fd66c-d992-433f-a2eb-3a2313c8b912.jpg?v=1754825449","Baren land with scorching sun",{"_69":703,"_580":704,"_662":705,"_664":706,"_666":707,"_668":708,"_596":709},"gid://shopify/Article/999025049974","Wildfire Map Spotlight: Lee Fire, Colorado","The Lee Fire in northwestern Colorado has scorched over 60,000 acres, the 8th largest in state history. Learn about affected areas, containment, and smoke protection tips.","What is the name and location of the wildfire? As of August 9, 2025, the Lee Fire is burning in Rio Blanco County, northwestern Colorado, west of Meeker near Colorado 64 (1). Started by lightning on August 2, 2025, it has scorched over 60,000 acres, the 8th largest in Colorado's history, fueled by drought and winds up to 45 mph (2). For a more detailed look, see Meeker's fire and air quality map. Which cities or areas are affected by the Lee Fire? The fire affects the following areas: Colorado 13 Corridor Fourteenmile Creek Meeker Rio Blanco County The west and southeast of Meeker, including the Grand Hogback ridgeline is effected badly (3). Smoke impacts air quality across the Western Slope, with red flag warnings issued (4). What is the current containment status of the Lee Fire? The Lee Fire is at 0% containment, with 528 firefighters and Colorado National Guard helicopters deployed. Hotshot crews have built firelines, but extreme conditions, including low humidity of 6%, hinder progress, potentially causing large growth (5). Are there any evacuation orders or alerts in place? Pre-evacuation notices are in place for Meeker, downgraded to \"ready\" status, with roadblocks requiring ID for access. Residents are urged to prepare emergency kits and avoid dry grass. How can I protect myself from wildfire smoke? Always plan ahead to protect yourself from wildfire smoke. Get a free air quality app for real-time air quality alerts and forecasts. Shut doors and windows and set the HVAC to recirculate mode. Run a high-performance air purifier to filter wildfire smoke. Contribute to your community’s outdoor air quality data. Stay indoors; if you do need to go outdoors, wear a KN95/FFP2 mask.","wildfire-map-spotlight-colorado","2025-08-09T17:32:45Z",{"_92":710,"_89":-5},"https://cdn.shopify.com/s/files/1/0677/4059/8571/articles/ForestFire2Desktop_b654bcbb-35a0-4d8e-a89c-38d6e72eaf54.jpg?v=1754913060","cta",{"_584":713,"_580":714},"/newsroom?tag=Air%20Quality","all air quality news","productCta",{"_69":717,"_580":718,"_582":719,"_640":721,"_588":722,"_655":753,"_715":-7},"air-monitors","Air Monitors",{"_584":720,"_586":587},"/products/air-quality-monitors",[642],[723,730,739,744],{"_69":724,"_580":725,"_22":726,"_596":727,"_582":729},"airVisualSensors","AirVisual Sensors","World's smartest air monitors",{"_598":728,"_600":728},"/dl/assets/nav/air-monitors/av_series@1x.webp",{"_584":720,"_586":587},{"_69":731,"_580":732,"_22":733,"_596":734,"_582":736},"featuredContributors","Featured Contributors","Learn about our featured data contributors around the world and how they help their communities improve air quality.",{"_598":735,"_600":735},"/dl/assets/nav/air-monitors/featured-contributors.webp",{"_584":737,"_586":587,"_580":738},"/featured-contributors","see contributors",{"_69":633,"_580":634,"_22":635,"_596":740,"_582":742},{"_598":741,"_600":741},"/dl/assets/nav/air-monitors/community.webp",{"_584":639,"_586":587,"_580":743},"our challenge",{"_69":745,"_580":746,"_22":747,"_596":748,"_582":750},"communityMonitoring","Community Monitoring","IQAir AirVisual Platform offers easy and convenient ways to share data and provide critical air quality data globally.",{"_598":749,"_600":749},"/dl/assets/nav/air-monitors/IQAirAirVisualPlatform.webp",{"_584":751,"_586":587,"_580":752},"/community-air-quality-monitoring","find out more",{"_657":754,"_711":799},[755,763,772,781,790],{"_69":756,"_580":757,"_662":25,"_664":758,"_666":759,"_668":760,"_596":761},"gid://shopify/Article/998681313654","Revealing the Invisible: St. Andrews International School Bangkok","A Vision for Healthier Learning Environments Since 2018, St. Andrews International School Bangkok has taken proactive steps to protect students and staff from the harmful effects of air pollution. By installing IQAir AirVisual air quality monitors, integrating air purifiers, and implementing clear air quality action plans, St. Andrews has created a healthier learning environment while setting an example for other schools in Thailand. \"We don’t just track air quality—we act on it.\"– Roo Stenning, St. Andrews International School Bangkok From Concern to Action: Why Air Quality Monitoring Matters Bangkok’s air pollution is a well-known issue, particularly during the dry season when PM2.5 levels rise to hazardous levels. Before 2018, St. Andrews relied on external air quality data from various sources, but inconsistencies often led to confusion. Parents checking different monitoring stations would sometimes see conflicting air quality readings, creating concern and debate. Recognizing the need for a more reliable and transparent system, the school decided to install its own monitors. IQAir’s AirVisual devices became their solution, providing real-time, on-campus air quality data that both school staff and parents could trust. “We wanted our students, staff, and parents to see the same data and trust it,” explains Roo Stenning, the school’s Head of High School. Now, with two dedicated outdoor air quality monitors providing live readings, the school community can make informed decisions about outdoor activities. The initiative has expanded beyond campus as well—portable monitors are even sent on school field trips, allowing students and staff to track air quality no matter where they are in Thailand. \"Parents no longer have to guess or compare conflicting sources. They can check our data and know exactly what actions we are taking,\" said Stenning. Turning Data into Action: A Structured Approach Reliable air quality data is only useful if it leads to meaningful action, and St. Andrews has developed a clear, structured response to fluctuating air conditions. \"We aim to be proactive, not reactive. Our students spend most of their day at school, so we want to ensure they are breathing the cleanest air possible,\" Stenning said. The school follows the U.S. Air Quality Index (US AQI) guidelines, ensuring that all decisions are based on international best practices. When air quality remains in the healthy range, daily routines continue as usual. However, once the AQI surpasses 100, outdoor activities are moderated, and younger students, who are more sensitive to pollution, are advised to limit their exposure. At an AQI of 200, all outdoor activities are suspended to ensure the health and safety of students and staff. Recent updates to US AQI standards have made pollution thresholds more stringent, meaning Bangkok now experiences fewer ‘green days’ than in past years. The school actively communicates these changes to parents to ensure a clear understanding of what the data reflects. To ensure quick, informed decision-making, air quality levels are checked five times a day at key moments: before school, during morning break, and at lunch periods. If air pollution levels reach concerning thresholds, a color-coded flag system is updated on campus, signaling whether students should remain indoors. This proactive approach ensures that every member of the school community—students, teachers, and parents—can respond to changing air quality in real time. Beyond the Classroom: Educating and Engaging the Community Air quality monitoring at St. Andrews is not just about data—it’s about education, empowerment, and fostering environmental responsibility. The school actively involves students in air quality discussions, encouraging them to take an interest in environmental science and sustainable living. Students and parents can access real-time air quality data via the school’s web portal. Younger students have taken their awareness a step further by leading sustainability initiatives, such as anti-idling campaigns in the school’s parking lot. These student-led efforts encourage parents and drivers to turn off their car engines while waiting, reducing unnecessary emissions near the school. Classroom discussions also integrate air quality education, helping students understand the health impacts of pollution and the science behind air monitoring. By embedding these conversations into the curriculum, the school ensures that students are not just passive recipients of clean air policies but active participants in creating a healthier campus. \"Our hope is that by the time our students reach high school, they don’t just understand air quality—they actively engage in solutions,\" Stenning said. Innovating for the Future: Next Steps in Clean Air Commitment While St. Andrews has made significant progress in air quality management, the school is always looking ahead. One of its key focus areas is expanding indoor air quality monitoring. Currently, air purifiers are installed in over 100 classrooms, complemented by Energy Recovery Ventilation (ERV) systems that improve airflow while maintaining energy efficiency. The school is now exploring ways to aggregate data from these devices to provide a comprehensive picture of indoor air conditions. Another step forward is integrating real-time air quality displays on campus. While the school already uses a flag system to communicate air quality updates, adding live AQI readings on digital screens would enhance visibility and accessibility for students and staff. Conclusion St. Andrews International School Bangkok demonstrates how schools can take charge of air quality to protect their students and staff. Through real-time monitoring, clear action plans, and proactive community engagement, the school has set a benchmark for clean air in education. Their leadership in air quality monitoring aligns with global initiatives like IQAir’s Schools4Earth program, which helps schools worldwide gain access to real-time air quality data. By joining a growing network of schools contributing to air monitoring, St. Andrews is not just improving air quality on campus—it’s helping shape a global movement for cleaner air.","revealing-the-invisible-st-andrews-international-school-bangkok","2025-07-29T22:30:00Z",{"_92":762,"_89":-5},"https://cdn.shopify.com/s/files/1/0677/4059/8571/articles/StAndrews_Desk_B_8a6e2e8c-c0e3-4023-8a68-dfb1e6d536b2.jpg?v=1753944083",{"_69":764,"_580":765,"_662":766,"_664":767,"_666":768,"_668":769,"_596":770},"gid://shopify/Article/998656999798","How IQAir ensures data quality on the AirVisual platform","Discover how IQAir maintains the accuracy and trustworthiness of global air quality data on the AirVisual platform.","Access to accurate air quality data can influence everything from public health decisions to climate research and policy. It’s critical that air quality data is trustworthy. IQAir is dedicated to delivering real-time, reliable, high-quality air quality information to people and organizations around the world. Air quality data must be available in real-time and easily understood, so that everyone can immediately act and protect themselves from the serious health threat posed by air pollution. This commitment drives a comprehensive quality assurance process on the AirVisual platform—an approach grounded in scientific rigor, transparency, and collaboration. Accurate sensors are selected, validated, and calibrated to ensure that everyone has dependable, free access to air quality information at their fingertips. For a deeper look at the quality assurance processes, hear directly from Dr. Christi Chester Schroeder, IQAir’s Director of Air Quality Science. IQAir’s approach to quality assurance IQAir both manufactures air quality monitors and hosts AirVisual, a comprehensive, freely accessible air quality data platform. This approach to quality assurance is built on a foundation of scientific precision and continuous improvement. AirVisual Outdoor air quality monitors undergo a combination of rigorous laboratory testing and real-world performance evaluations; the AirVisual Outdoor’s high accuracy has been verified by the Swiss Federal Institute of Metrology (METAS). Each sensor must meet strict criteria before being approved for deployment on the AirVisual platform, ensuring that every data point shared is rooted in reliability from the start. The AirVisual platform aggregates air quality data from both low-cost sensors and reference monitors, publishing data from over 30,000 air quality monitoring stations in more than 140 countries and 15,000 cities around the world. Roughly half of the data on the AirVisual platform comes from low-cost sensors, and the other half from government-operated monitors. Low-cost sensors, like the AirVisual Outdoor, are usually deployed by individuals and organizations. The AirVisual platform is sensor-agnostic; there are approximately ten different low-cost sensor types on the platform. Regardless of the source and whether air quality contributors maintain one sensor or a network of sensors, all sensors undergo verification and calibration. Regardless of the source and whether air quality contributors maintain one sensor or a network of sensors, all sensors undergo verification and calibration. IQAir employs a combination of automated algorithms and manual review processes to detect and correct anomalies in real time, maintaining consistency and accuracy across the network. Sensor validation Sensor validation is a critical first step in IQAir’s quality assurance process. Before devices are added to the AirVisual platform, they must undergo extensive evaluation to ensure they meet the required standards for accuracy and reliability. The location and placement of every AirVisual Outdoor sensor is manually verified through photos before it is added to the platform, assuring that the sensor is both outdoors and in an appropriate location. Sensors are assessed for their ability to produce consistent, precise measurements over time, minimizing data gaps and maximizing data completion. All sensors are assessed for their ability to produce consistent, precise measurements over time, minimizing data gaps and maximizing data completion. That means they must: Maintain a stable power and network connection for equal to or greater than 3 days, with consistent data. Have a reasonable correlation with surrounding stations. Publish air quality data at least on an hourly basis, or shorter when possible. Devices that demonstrate strong correlation with surrounding stations and maintain stability in challenging environmental conditions are selected for publication. Those that don’t meet those standards won’t be published. Sensor calibration Ongoing sensor calibration assures that air quality data published on AirVisual is consistent and error-free. These ongoing checks help identify any drift or discrepancies, allowing for timely adjustments. Ongoing sensor calibration assures that air quality data published on AirVisual is consistent and error-free. With multiple sensor types publishing data on the AirVisual platform, it is important that raw data is assessed, cleaned, and calibrated before publication. Quality control procedures are incorporated into the data pipeline that mathematically assess individual data points, evaluating whether a station's data is so outlying that it may be considered an outlier. Some criteria may trigger a data quarantine or a station being unpublished. Examples of criteria that may flag data for a review and quarantine include: Reporting less than five hours of historical data. Data point exceeding pollutant specific designated concentration threshold. A data outlier detected relative to other area stations. In some cases, a sensor may need to be unpublished entirely: Reporting the same concentration value for 24 hours. Reporting concentrations of 0 for more than 12 hours. Stopping data reporting for six hours. While automated quality control procedures are continuously running on the platform, users can also report when they see issues with a station through the AirVisual app. Advanced data checks Automated and manual QC processes identify and correct sensor reading anomalies in real time.Both automated algorithms and manual review processes work in tandem to detect and correct anomalies in real time, minimizing the potential for errors and ensuring data consistency. These checks continuously monitor incoming data, flagging any irregularities such as sudden spikes or unexpected trends – departures from the historical data or weather conditions – that could signal equipment malfunctions or environmental interference. Environmental compensation Atmospheric factors such as humidity and temperature can influence sensor readings. For instance, high humidity might result in low-cost sensors overreporting PM2.5 concentrations in an area. To counteract this, IQAir employs correction algorithms that automatically adjust sensor output to account for these environmental variables. These algorithms use real-time environmental data to correct for the effects of fluctuating conditions, ensuring that air quality measurements remain consistent and reliable across a wide range of climates. Commitment to transparency and collaboration IQAir is committed to openly sharing quality assurance methods, validation processes, and results. This ensures that everyone can trust the integrity of the data provided on the AirVisual platform. IQAir actively collaborates with governments, researchers, and NGOs to independently verify the data quality. Partnerships with organizations like the United Nations Environment Programme and Greenpeace allow IQAir to validate methods and contribute to the broader global conversation about air quality monitoring (1). IQAir also works with networks ranging from the Main Astronomical Observatory (MAO) in Kyiv, Ukraine to air quality sensor researchers in Ghana to advance everyone’s global understanding of air quality data. These collaborations help continually refine and improve IQAir systems to better support public health and inform environmental policy worldwide. Community Stories: Real People Powering Global Air Insights The AirVisual platform is more than a technical network—it’s powered by a global community of educators, environmental advocates, and everyday citizens using data to drive change. IQAir is proud to spotlight some of the many contributors making a difference: Permian Health’s air quality crusade in Gambia: A rural health initiative using real-time PM2.5 data to inform public health and drive national air quality policy. WWF-Pakistan: A 15-city sensor network providing real-time data to raise awareness and inform environmental policy. Clean Air One Atmosphere in West Africa: A citizen science project using IQAir sensors to educate, engage schools, and identify pollution hotspots. Community centers in Michigan and Bangkok: Local leaders use IQAir monitors to raise environmental awareness and guide safe outdoor activity. These global contributors—and thousands more around the world—form the heart of the AirVisual network. Their commitment to transparency, awareness, and health creates a more informed and empowered world. Turning Data Into Action: Tools for Learning and Impact The goal isn’t just to publish accurate data—it’s to make that data meaningful and actionable for everyone. IQAir provides intuitive tools and resources to help individuals, schools, and communities interpret air quality trends and take steps toward cleaner air: The AirVisual App helps users compare local air to global benchmarks and receive real-time alerts. Custom dashboards for schools, clinics, and NGOs support public engagement and localized action. Educational collaborations with researchers bring data into classrooms, empowering students to explore air quality in hands-on ways. Community feedback tools within the platform allow contributors to flag anomalies and drive continuous improvement. Democratizing air quality data helps turn awareness into advocacy—and science into better public health outcomes. Conclusion At IQAir, the integrity of AirVisual data is built on a foundation of scientific rigor, transparency, and an unwavering commitment to public health. Through meticulous sensor validation, continuous calibration, real-time data checks, and collaboration with the global air quality monitoring community, IQAir ensures that every piece of air quality data provided is accurate, reliable, and trustworthy. This approach to quality assurance reflects the company’s dedication to supporting informed decision-making and promoting healthier, cleaner environments worldwide.","how-iqair-ensures-data-quality-on-the-airvisual-platform","2025-06-09T22:00:00Z",{"_92":771,"_89":-5},"https://cdn.shopify.com/s/files/1/0677/4059/8571/articles/AQL_QAAirMonitors_Desk_A_c838ebaa-8382-4d41-8389-52b3a0566bc0.jpg?v=1753738006",{"_69":773,"_580":774,"_662":775,"_664":776,"_666":777,"_668":778,"_596":779},"gid://shopify/Article/998607683958","5 Most polluted major cities in the world in 2024","Major cities worldwide can experience some of the worst air pollution, placing millions at risk. Discover which larger cities faced the highest pollution levels in 2024.","The 2024 World Air Quality Report is out. It reveals ongoing, alarming levels of pollution in many major cities worldwide. Urban residents face heightened air pollution challenges due to higher concentration of pollutants, weak regulatory enforcement, overburdened infrastructure, and rapidly growing populations. For people living in the five most polluted cities, unhealthy air exposure was an almost daily reality in 2024. Several of these cities have consistently ranked among the most polluted globally year after year. “More than 96 million people reside in the five most polluted cities in the world.” More than 96 million people reside in the five most polluted cities in the world. Millions more endured frequent exposure to poor air quality throughout 2024. 5. Karachi, Pakistan Karachi, the largest city in Pakistan, grapples with significant air quality issues. In 2024, the city’s average annual PM2.5 concentration was 47.1 µg/m³. After five years of increasingly worsening air quality, this does represent an improvement air quality over previous years. In 2023, the average annual PM2.5 concentration was 56.1 µg/m³. However, 47.1 µg/m³ is well within the range of “very unhealthy” air quality levels and above 2021’s annual average of 45.9 µg/m³. Much more work is needed to keep Karachi’s more than 18 million people safe from air pollution. Karachi’s air quality suffers due to vehicles emissions, industrial activity, brick kiln activity, crop residue burning, and naturally occurring dust storms (1). Large numbers of aging vehicles combined with weak emission regulations frequently creates poor air quality days (2). Factories operate with minimal pollution controls. Additionally, rapid urbanization, accompanying construction work, and the region’s dry climate contribute to increased airborne dust levels. Stronger, better enforced industrial pollution and vehicle emissions policies are desperately needed to control Karachi’s pollution at its source Poor air quality in Karachi, Pakistan on March 21, 2025. Source: IQAir Map. 4. Kinshasa, Democratic Republic of the Congo Kinshasa is the capital and largest city in the Democratic Republic of the Congo (DRC). Its average annual PM2.5 concentration in 2024 was 58.2 µg/m³, a sharp increase from 2023’s average annual concentration of 15.5 µg/m³. In 2024, the DRC was the second most polluted country in Africa, after Chad. As is too often the case throughout much of the continent, both nations lack comprehensive air quality monitoring. While some monitoring exists in the DRC, many more reliable and consistently operating stations are needed to help measure poor air quality affecting millions of people in the vast nation. Known air pollution sources include indoor cooking with wood and charcoal, forest fires, and regional agricultural and industrial activities (3). Air quality in Kinshasa, Democratic Republic of the Congo on March 21, 2025. Source: IQAir Map. Air quality in Kinshasa, Democratic Republic of the Congo on March 21,2025. Source: IQAir Map. 3. Dhaka, Bangladesh In 2024, the average annual PM2.5 concentration in Dhaka reached 78 µg/m³. While a modest improvement over 2023’s annual average of 80.2 µg/m³, it is still a notable rise from the 2022 average of 65.8 µg/m³. The capital of Bangladesh, Dhaka’s air pollution originates from multiple sources, including vehicle emissions, brick kilns, dust from roadways, industrial activity, household cookstoves, plastic burning, and unmanaged waste sites (4). There are an estimated 1,200 brick kilns in the country – 790 of which are operating illegally and are not approved by Bangladesh’s Department of Environment (5). To combat this pollution source, the government is demolishing illegal kilns and closing kilns using wood or low-quality coal. While addressing emissions from brick production remains a challenge, authorities aim to introduce technological advancements and stricter controls to curb pollution. Air quality in Dhaka, Bangladesh on March 20, 2025. Source: IQAir Map. 2. Lahore, Pakistan Lahore, Pakistan faced hazardous air quality in 2024, with an annual average PM2.5 concentration of 102.1 µg/m³. Once the most polluted city in the world in 2022, it’s an annual average that continues to rise in recent years: from 86.5 in 2021 to 99.5 in 2023. Every year since 2017, the city has endured hazardous level air quality. 14 million residents in Lahore regularly experience thick smog due to seasonal crop burning in Punjab Province, heavy vehicular emissions, and widespread pollution from brick kilns. 83% of Lahore’s poor air quality comes from vehicle emissions (6). Local air quality activists continue to press for more widespread air quality monitoring, government transparency, and increased public awareness, but major obstacles remain in reducing pollution sources. Air quality in Lahore, Pakistan on March 20, 2025. Source: IQAir Map. 1. Delhi, India More than 32 million people live in Delhi, India, making it the second-largest city on Earth. In 2024, Delhi found that its average annual PM2.5 concentration had climbed to 108.3 µg/m³, up from 102.1 µg/m³ in 2023. Delhi ranked as the fourth most polluted major city in both 2021 and 2022 and the fifth in 2023, demonstrating a continually worsening trend in air quality. The city's pollution is fueled by regional crop burning, vehicle emissions, coal power plants, and landfill fires. In October 2024, India’s Supreme Court reaffirmed clean air as a fundamental right, ordering the central and state governments to strengthen pollution control (7). It found limited action on stubble burning despite past rulings and demanded compliance reports. In November, the Court criticized Delhi officials for “serious lapses” in enforcing emergency pollution measures (8). Hazardous and unhealthy air quality in Delhi, India on March 25, 2025. Source: IQAir Map. What you can do Air pollution can profoundly harm human health, but solutions exist. You can contribute to cleaning your own city’s air pollution by taking these actions: Advocate for change: Contact local representatives to push for stronger air quality policies and regulations. Reduce personal emissions: Use energy-efficient appliances, walk, bike, or take public transport when possible. Stay informed: Download a free air quality app to monitor pollution levels. When air quality is poor, minimize outdoor exposure, purify indoor air, or wear a high-quality mask. Protect kids at school: Advocate for schools in your area to join the Schools4Earth program. Join the clean air movement! Become a data contributor. Community-driven data collection improves pollution awareness and empowers people to take action. Conclusion Reliable air quality data is essential to understanding and addressing urban air pollution. Unfortunately, many regions, including Africa, West Asia, Latin America, and the Caribbean, still lack comprehensive air monitoring systems. Global, real-time access to air quality data enables people to take necessary precautions, influence policy, and reduce pollution at its source. Expanding air quality monitoring worldwide can save lives and improve public health outcomes.","5-most-polluted-major-cities-in-world-2024","2025-06-02T22:00:03Z",{"_92":780,"_89":-5},"https://cdn.shopify.com/s/files/1/0677/4059/8571/articles/polluted-city-desktop-final_b56d5fe9-2240-4378-acf7-464d5aeafc66.webp?v=1751480321",{"_69":782,"_580":783,"_662":784,"_664":785,"_666":786,"_668":787,"_596":788},"gid://shopify/Article/998392660342","Defunding U.S. Embassy air quality monitoring and its global consequences (Part 4 of 4)","U.S. embassies have helped transform global health outcomes through air quality monitoring – and now, that progress is at risk.","This is the final installment of a four-part series exploring how U.S. Embassies positively impact air quality monitoring around the world. In March 2025, the U.S. Department of State announced that it would end its global air quality monitoring program, citing budgetary concerns (1). This decision will have far-reaching consequences for air quality data access and public health worldwide. For over a decade, the State Department’s air quality monitoring program has provided real-time air pollution data from more than 80 embassies and consulates, filling critical monitoring gaps in regions where governments lacked their own means to track air pollution effectively. Global impact of U.S. Embassy air quality monitoring With a stated end date of March 2025, the program’s termination marks a significant shift in U.S. environmental engagement. For years, U.S. embassies and consulates in countries with limited air quality infrastructure have provided real-time, regulatory-grade air quality data to the public and policymakers. This data has been instrumental in shaping air pollution awareness, influencing policy discussions, and enabling communities to take protective measures against hazardous air conditions. This data has proven essential in changing air pollution policy in China and providing, at times, the only air quality monitoring in Central Asian and African countries. Air quality in the most polluted country in the world for both 2022 and 2024, Chad, was only made available in 2024 through U.S. State Department air quality data sharing. With 75,000 employees around the world, the Department of State has a vested interest in ensuring personnel and their families have the data they need to make informed decisions to protect their health. Beyond public health advocacy, the monitoring program also directly informed safety protocols for U.S. diplomats and their families stationed abroad. According to the State Department, they have “75,000 employees around the world” and “a vested interest in ensuring personnel and their families have the data they need to make informed decisions to protect their health (2).” Real-time data helped embassies assess air pollution risks and implement mitigation measures, establishing guidelines that minimize exposure to pollutants. \"For many cities, these monitors provided the only reliable real-time air quality data available. Without them, millions may be left uninformed about pollution risks.\" – Dr. Christi Chester Schroeder \"Ending this program is a huge setback for global air quality transparency,\" said Dr. Christi Chester Schroeder, Air Quality Science Manager at IQAir. \"For many cities, these monitors provided the only reliable real-time air quality data available. Without them, millions may be left uninformed about pollution risks.\" Role of U.S. monitoring in global air quality improvements The U.S. State Department air quality monitoring program played a pivotal role in improving air quality worldwide by providing high-accuracy, regulatory-grade data. This data helped calibrate and validate thousands of low-cost air quality sensors used by local governments, NGOs, and researchers, improving the reliability of broader air quality monitoring efforts. By establishing a trusted baseline, State Department monitors supported local initiatives and strengthened regional air pollution tracking capabilities. State Department monitors directly contributed to measurable improvements in air quality. In China, for example, when U.S. embassies in Beijing and other cities began publishing real-time PM2.5 data, public awareness surged, and local authorities were pressured to act. This led to stricter emissions regulations, cleaner industrial practices, and significant reductions in fine particulate matter pollution over the following years. Cities with a U.S. monitor saw substantial reductions in fine particulate concentrations, lowering the risk of premature death for more than 300 million people. A 2022 study published in the Proceedings of the National Academy of Sciences found that when U.S. embassies began tracking local air pollution, host countries took action (3). Since 2008, cities with a U.S. monitor saw substantial reductions in fine particulate concentrations, lowering the risk of premature death for more than 300 million people. Diplomacy and international partnerships The air quality monitoring program has been widely regarded as one of the most cost-effective initiatives undertaken by the State Department (4). The program not only protected U.S. personnel abroad but also enhanced transparency in foreign countries, often holding local governments accountable for pollution levels. Accurate and reliable data fostered goodwill with local populations, as residents, researchers, and policymakers increasingly relied on the embassy monitors to understand air quality trends. This data-driven diplomacy helped strengthen international partnerships in environmental health, encouraging governments to address pollution concerns more proactively. The decision to halt data transmission is expected to save only tens of thousands of dollars—a modest cost given the program’s global reach and public health value (5). Air quality monitoring program ends Ending the State Department air quality monitoring program will create significant data gaps, particularly in regions where independent monitoring has been scarce. 17 years of data have been removed from airnow.gov, erasing a vital record of global air pollution trends and public health benchmarks (6). Some countries will lose access to real-time air quality data, leaving millions without a reliable source of information on pollution levels. For many countries, U.S. embassy monitors were the only source of real-time, validated air quality data—without them, transparency and public protections will be severely diminished. The lack of regulatory-grade data will also diminish transparency, making it harder for journalists, researchers, and policymakers to track pollution trends and hold governments accountable. The future of air quality data and monitoring With the end of the U.S. Department of State air quality monitoring program scheduled for the end of March 2025, there is an urgent need for new solutions to fill the gap left by this critical data source. Global air quality monitoring efforts must continue to ensure that the public remains informed about pollution and equipped to make health-conscious decisions. Through partnerships and innovations, communities can maintain access to real-time air quality data of low-cost sensors, despite the loss of the embassy network. However, regulatory-grade monitors provided by the U.S. Department of State will still be needed to help calibrate and validate low-cost sensor data. Conclusion The end of the U.S. Department of State air quality monitoring program marks a significant setback for global air quality transparency and public health. This program has been instrumental in providing reliable, real-time data to regions with limited air quality infrastructure, empowering local communities and governments to take action against pollution. As U.S. embassies withdraw their data, the international community faces a challenging road ahead in maintaining air quality monitoring efforts and ensuring that vulnerable populations can access public health information. If the U.S. continues to withdraw from its global commitment to public health and safety, it will require collaboration, innovation, and sustained commitment from other governments, NGOs, and international organizations to fill the gap left by the program’s termination.","defunding-us-embassy-air-quality-monitoring-and-its-global-consequences","2025-05-11T22:00:02Z",{"_92":789,"_89":-5},"https://cdn.shopify.com/s/files/1/0677/4059/8571/articles/DefundingAirMonitoringConsequences_Desk_B_539f86a5-5f16-4ab1-8e26-a7bf0259e70c.jpg?v=1751067528",{"_69":791,"_580":792,"_662":793,"_664":794,"_666":795,"_668":796,"_596":797},"gid://shopify/Article/998373851510","How U.S. embassies advanced air monitoring across Central Asia (Part 3 of 4)","American embassies helped spark a change in air quality across Central Asia. Read the untold story to learn why.","This is the third installment of a four-part series exploring how U.S. Embassies positively impact air quality monitoring around the world. Central Asia is facing a growing public health crisis due to air pollution. In 2024, Tajikistan ranked as the sixth most polluted country in the world—highlighting the urgent need for reliable data and cleaner air. Central Asian cities frequently face hazardous air quality levels due to coal burning for cooking and home heating, industrial emissions, vehicle traffic, frequent dust storms, and limited environmental regulations (1)(2). These sources of air pollution have significant health implications for residents and contribute to the growing environmental challenges in the region. In recent years, the U.S. State Department has tried to help improve regional air quality awareness. Starting with Astana, Kazakhstan and Tashkent, Uzbekistan, U.S. embassies in Central Asia began installing air quality monitors over the past decade to help improve regional health outcomes (3)(4). These regulatory-grade monitors provided real-time, independent air quality data, filling a critical gap in a region where governmental air quality monitoring is often sparse or non-existent. Embassy air quality data became an invaluable tool for assessing pollution levels and understanding the environmental risks faced by local populations – a tool now at risk as the U.S. prepares to phase out this program globally. How U.S. Embassy monitoring made a difference As noted in the 2024 World Air Quality Report, Central Asian countries have long struggled with a lack of real-time air pollution monitoring, making it difficult for governments, activists, and citizens to track pollution levels and advocate for effective clean air policies. Without reliable data from air quality monitors, the true scope of air pollution remained largely invisible, complicating efforts to address the issue. This was especially true for pollutants like PM2.5, which is fine particulate matter measuring 2.5 microns or less. PM2.5 is particularly harmful, because it is small enough to penetrate deep into the lungs and bloodstream, leading to respiratory issues, heart diseases, and increased mortality. Cities like Almaty, Kazakhstan, Tashkent, Uzbekistan, and Bishkek, Kyrgyzstan are profoundly affected by poor air quality, especially in winter, due in part to coal burning for home heating and temperature inversions trapping pollutants in the region’s valleys and foothills. The need for accurate, real-time data became urgent to both understand the scale of the problem and to advocate for change. In response, U.S. State Department embassies installed air quality monitors in key Central Asian capitals, providing real-time data on pollutants like PM2.5. This data was made publicly available, allowing local communities, NGOs, and researchers to gain a clearer understanding of pollution levels and the associated health risks (5). With this newfound transparency, air quality data from U.S. embassies became an essential resource for local media, leading to increased public awareness and coverage of the urgent issue of air pollution. Building local expertise and advocacy The U.S. State Department built on health advocacy efforts by funding local NGOs in Kazakhstan, Kyrgyzstan, Tajikistan, and Uzbekistan to build local expertise in air quality monitoring and policy development (6). This initiative trained air quality experts throughout the region, equipping them with the skills needed to measure pollutants, analyze data, expand local air quality awareness, and advocate for clean air policies. While air quality laws in Central Asia remain underdeveloped, the training program and growing air pollution awareness contributed markedly to the region's evolving approach to environmental regulation – and local activists have seen results in recent years. Slow air quality improvements and challenges in Central Asia In recent years, some Central Asian cities have seen modest improvements in air quality. Kazakhstan, for example, has made progress in reducing emissions from its coal-burning power plants and is beginning to phase out older, more polluting vehicles in favor of electric vehicles (7)(8). In 2024, Uzbekistan announced plans to roll out national air quality standards, a monitoring platform, and a mobile application (9). In 2025, Uzbekistan's Senate approved a law fining construction companies for failing to reduce sand and dust from construction sites (10). However, despite these positive changes, many Central Asian cities continue to struggle with poor air quality. Heavy reliance on coal for energy production, industrial pollution, and outdated transportation systems remain significant challenges. Dust storms, particularly in Uzbekistan and Turkmenistan, also contribute to hazardous pollution levels. Some governments in the region still lack comprehensive air quality monitoring and enforcement systems, which are essential for tracking pollution levels and ensuring effective policy implementation. For example, the U.S. State Department hosts the primary air quality monitors in Ashgabat, Turkmenistan and Bishkek, Kyrgyzstan—with little additional air quality monitoring available for either country outside of their respective capital cities. U.S.-backed air quality campaign in Central Asia In 2020, the U.S. launched a comprehensive air quality awareness campaign in Central Asia, utilizing television broadcasts and social media to reach a broad audience and raise awareness about the dangers of air pollution. The campaign successfully reached 11 million people through television, sparking widespread conversation about air pollution and its health impacts (11). Media coverage of embassy air quality data played a pivotal role in pushing air pollution to the forefront of public health discussions in the region. Increased air pollution visibility helped drive public pressure for policy changes, with several Central Asian governments acknowledging the urgent need for stricter regulations and more robust air quality monitoring systems. Despite those assurances, embassy air quality monitors are viewed as crucial for maintaining accountability and accuracy. For instance, the embassy monitor in Dushanbe, Tajikistan, is considered essential by environmental activists for understanding the city’s air quality, as they fear government officials may be incentivized to downplay the air quality crisis (12). The end of embassy monitoring and its impact The U.S. State Department announced its intent to shutter its air quality monitoring program at embassies worldwide by the end of March 2025. The Department cites cost as a factor. Given that U.S. State Department data has played a critical role in providing real-time, independent information on air pollution, it’s a decision that has drawn concern among researchers and advocates; the actual cost of transmitting data is “just tens of thousands of dollars a year,” according to one researcher (13). On the scale of government funding expenses, it’s a relatively small investment that helps secure goodwill in host countries, reducing public health costs, and protecting embassy workers and families. Eliminating these embassy monitors will make it more difficult to understand air pollution sources, health implications, and successfully push for cleaner air policy in the region. Environmental activists, who have often been subject to government persecution, will lose crucial support and reliable data backing their efforts to effect change (14). The takeaway U.S. State Department air quality monitoring has been instrumental in raising pollution awareness and successfully advocating for clean air policies in Central Asia. Independent data provided by these regulatory-grade monitors has empowered local communities, experts, and NGOs to advocate for meaningful policy changes and air quality improvements. It makes little sense to cease publishing data, particularly when these air quality monitors have improved public health in their host countries and, as researchers note, have already paid for themselves (15). While others may work to fill the growing air quality gap, the State Department still has an opportunity: restore access to publicly funded data from monitors that have already proven their value in supporting U.S. diplomacy abroad. Doing so would help keep air quality a shared priority for governments and citizens—and support continued policy improvements across Central Asia. Next week: In our final installment in this four-part series, learn about defunding U.S. Embassy air quality monitoring and its global consequences. Missed our previous installments? Start with how the U.S. State Department started a Chinese environmental movement and see how U.S. embassies champion air quality in Africa.","how-us-embassies-advanced-air-quality-monitoring-across-central-asia","2025-05-06T07:00:07Z",{"_92":798,"_89":-5},"https://cdn.shopify.com/s/files/1/0677/4059/8571/articles/StateDept-CentralAsia_Desk_c5d5dc17-30cd-4468-89a9-b14a8387245c.jpg?v=1751067539",{"_584":800,"_580":801},"/newsroom?tag=Community","All Community News",{"_69":803,"_580":313,"_582":804,"_588":806,"_715":841},"air-purifiers",{"_584":805,"_586":587},"/products/air-purifiers",[807,815,823,832],{"_69":808,"_580":809,"_22":810,"_596":811,"_582":813},"healthProSeries","HealthPro Series","Award winning, Medical-grade air filtration",{"_598":812,"_600":812},"/dl/assets/nav/air-purifiers/HPP_MM_AtHomeMenu_0523.png",{"_584":814,"_586":587},"/products/air-purifiers?filter.v.m.custom.series=HealthPro%20Series",{"_69":816,"_580":817,"_22":818,"_596":819,"_582":821},"atemSeries","Atem 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