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Learn more about causes, forecasts, and health tips.","content","Is the air quality good in Delhi? On August 26, 2025, at 10:00 PM PT, Delhi, India, is experiencing moderate air quality with an AQI of 137, bordering on unhealthy for sensitive groups. Some neighborhoods show higher levels, posing risks to children, the elderly, and those with respiratory issues. Air quality is dynamic and can change rapidly. Delhi ranked as the 4th most polluted major city today, with nearby Gurugram and Noida also impacted. Click here for a real-time air quality map of Delhi. While conditions are unusually poor today, the 2024 average PM2.5 in Delhi was 108.3 µg/m³, equating to an AQI of 178 (\"unhealthy\") and 21.7 times the WHO annual guideline of 5 µg/m³. Delhi, India ranked as the 4th most polluted major city on August 26, 2025. Source: IQAir. When will air quality improve in Delhi? Air quality tends to fluctuate over short periods. It is forecasted to improve gradually by Thursday, with potential rains and winds dispersing pollutants, possibly dropping to AQI 80 (moderate). Due to the seasonal transition, slight relief may occur briefly however, sustained improvement depends on changes in emission sources, weather conditions, and regional cooperation. Hourly air quality forecast for Delhi, India on August 26, 2025. Source: IQAir. Air quality map of Delhi, India on August 26, 2025. Source: IQAir. What is causing poor air quality in Delhi? Delhi’s severe air pollution stems from a mix of local and regional factors. Vehicle emissions, industrial activities, and construction dust play a major role in worsening urban air quality in the city (1). Crop residue burning in neighboring states such as Punjab and Haryana releases large quantities of smoke, contributing significantly to Delhi’s toxic haze during the post-monsoon season (2). Seasonal weather patterns, including temperature inversions and light winds during winter, trap pollutants close to the ground, amplifying smog intensity. Additionally, Delhi’s location within the larger Indo-Gangetic Plain allows cross-border pollution from other regions in India to exacerbate local air quality challenges (3). Explore high-performance air purifiers SHOP NOW 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.","handle","delhi-among-top-10-most-polluted-cities-in-the-world-08-27-2025","publishedAt","2025-08-27T05:55:08Z",{"_91":619,"_88":-5},"https://cdn.shopify.com/s/files/1/0065/4780/0182/articles/DelhiDesktop_f4490b8e-99c6-4264-8fbf-b2577e5fa9e1.jpg?v=1756274821",{"_68":621,"_540":622,"_610":623,"_612":624,"_614":625,"_616":626,"_556":627},"gid://shopify/Article/563517292681","Wildfire Map Spotlight: Idaho-Montana Fires","Find out more about the Island Creek, Corral Creek, Mire, East, Knowles, and Windy Rock wildfires impacting Idaho and Montana.","What are the names and locations of the wildfires? As of August 26, 2025, multiple wildfires are actively burning along the Idaho-Montana border, significantly impacting air quality in the region. The Island Creek Fire is located in Idaho County, Idaho, near the Selway River Corridor and Nez Perce-Clearwater National Forests, with fire activity creeping towards the Selway River (1). The Corral Creek Fire is burning in Missoula County, Montana, within the Lolo National Forest, near Albert Creek Road (2). The Mire Fire spans Idaho and Clearwater Counties, Idaho, close to the county line and near Saddle Camp and Marten Hill Roads (3). The East Fire is also in Idaho County, Idaho, with limited details on specific landmarks but actively burning in rugged terrain (4). The Knowles Fire is located in Sanders County, Montana, north of the Flathead River and near the Highway 200 corridor (5). Lastly, the Windy Rock Fire is burning in Idaho County, Idaho, within the Nez Perce-Clearwater National Forests, though specific geographical references are limited (6). Which cities or areas are affected by the wildfires? The cities and areas affected by the Island Creek, Corral Creek, Mire, East, Knowles, and Windy Rock Fires include: Challis, Idaho Camas Prairie, Montana Darby, Montana Hamilton, Montana McLaughlin, Montana Paradise, Montana Plains, Montana Salmon, Idaho Wildfire smoke from these fires is also impacting air quality in several towns across Idaho and Montana, though these are not directly impacted by the fire perimeters. What is the current containment status of the wildfires? As of August 26, 2025, containment efforts for the wildfires vary. The Island Creek Fire is 5% contained, with firefighters focusing on creating firebreaks and reducing fuels along Forest Service Roads to limit spread in rugged terrain. The Corral Creek Fire is 0% contained, though a control line has been established around the perimeter, with ongoing efforts to reinforce unburned pockets. The East Fire is 0% contained, with active burning in challenging terrain. The Knowles Fire is 16% contained, with successful burnout operations securing the eastern flank and efforts continuing to build direct and indirect lines. The Mire, East, and Windy Rock Fires are at 0% contained. Are there any evacuation orders or alerts in place? Evacuation orders and alerts vary across the affected wildfires. For the Island Creek Fire, a closure order is in effect for the Selway River Corridor from O’Hara to Race Creek, including all campgrounds and trails east of O’Hara Bridge, as well as O’Hara Road and additional roads. The Corral Creek Fire has prompted an Area and Road Closure in the 9 Mile Ranger District, affecting multiple National Forest System roads and trails, but no evacuations have been ordered. The Mire Fire has closures in place for Saddle Camp Road and Marten Hill Road, with no specific evacuation orders reported. The Knowles Fire has a pre-evacuation notice issued by the Sanders County Sheriff for residents in the McLaughlin area, with a community meeting held on August 20, 2025, at Plains Elementary School to address concerns (5). Protect yourself from wildfire smokeSee how a wildfire smoke air purifier can help clean your air. LEARN MORE 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. As of August 26, 2025, the Mire, Corral Creek, East, and Windy Rock Fires are 0% contained, the Island Creek Fire is 5% contained, and the Knowles Fire is 16% contained.","wildfire-map-spotlight-idaho-montana-fires","2025-08-26T19:56:53Z",{"_91":628,"_88":629},"https://cdn.shopify.com/s/files/1/0065/4780/0182/articles/BurningForest1Desktop_b79c8187-f899-4480-a38d-24c678259137.jpg?v=1756238215","Burning trees",{"_68":631,"_540":632,"_610":633,"_612":634,"_614":635,"_616":636,"_556":637},"gid://shopify/Article/563522535561","August 26, 2025: Lahore among top 10 most polluted cities in the world","Lahore ranked as the most polluted major city globally on August 26. Learn more about causes, forecasts, and health tips.","Is the air quality good in Lahore? On August 26, 2025, at 2:00 AM PT, Lahore, Pakistan, is experiencing \"unhealthy\" air quality with an AQI bordering on very unhealthy. Some neighborhoods show higher concentrations, posing risks to sensitive groups like children and the elderly. Air quality is dynamic and can change rapidly. Lahore ranked as the world's most polluted major city this morning, with nearby cities like Faisalabad also affected. Click here for a real-time air quality map of Lahore. While conditions are poor today, the 2024 average PM2.5 in Lahore was 102.1 µg/m³, equating to an AQI of 173 (\"unhealthy\") and 20.42 times the WHO annual guideline of 5 µg/m³. Lahore, Pakistan ranked as the most polluted major city on August 26, 2025. Source: IQAir. When will air quality improve in Lahore? Air quality is forecasted to improve gradually by late afternoon and potentially dip into the “Moderate” range mid-week as wind picks up and disperses pollution, though it may fluctuate with weather. Hourly air quality forecast for Lahore, Pakistan on August 26, 2025. Source: IQAir. Air quality map of Lahore, Pakistan on August 26, 2025. Source: IQAir. What is causing poor air quality in Lahore? Lahore’s persistent smog arises from multiple interlinked sources. Vehicle emissions, industrial activities, and dust from rapid urban construction form the backbone of urban pollution in the city (1). Seasonal crop stubble burning in nearby agricultural regions and emissions from traditional brick kilns release vast amounts of particulate matter into the air (3). Additionally, meteorological conditions, such as thermal inversions and calm winds during cooler months, trap pollutants close to the ground, worsening air stagnation. Finally, Lahore lies within a broader South Asia airshed, meaning persistent warming and industrial emissions are compounded by transboundary smog drifting in from neighboring India, further intensifying pollution episodes (2). Explore high-performance air purifiers SHOP NOW 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.","lahore-among-top-10-most-polluted-cities-in-the-world-08-26-2025","2025-08-26T13:58:51Z",{"_91":638,"_88":639},"https://cdn.shopify.com/s/files/1/0065/4780/0182/articles/LahoreDesktop_6994df73-3f0d-49cf-ba11-67e2ba1db481.jpg?v=1756271099","Image of mosque",{"_68":641,"_540":642,"_610":643,"_612":644,"_614":645,"_616":646,"_556":647},"gid://shopify/Article/563514015881","Wildfire Map Spotlight: Flat Fire, Central Oregon","Find out more about the Flat Fire in Central Oregon, its spread near Sisters, and the communities under evacuation orders.","What is the name and location of the wildfire? As of August 26, 2025, the wildfire named the Flat Fire is burning in Central Oregon, primarily northeast of the town of Sisters in Deschutes County, and extending into Jefferson County. The fire covers both public and private lands managed by the Oregon Department of Forestry, Bureau of Land Management, the Ochoco National Forest, and the Confederated Tribes of Warm Springs (1). Its location near popular landmarks, including the Sisters wilderness area and Lake Billy Chinook, has heightened concern for both residents and visitors. Which cities or areas are affected by the Flat Fire? The cities and areas affected by the Flat Fire include: Crooked River Ranch Lake Billy Chinook Redmond Sisters These communities are experiencing varying levels of evacuation orders and are at risk from the ongoing fire (3). Air quality alerts have been issued across multiple communities in Central Oregon as smoke from the Flat Fire continues to spread. Current AQI levels are ranging between 150 and 200, which fall into the categories of unhealthy to very unhealthy conditions for residents. The areas under active air quality alerts include: Beaver Marsh Bend Crescent Deschutes River Woods La Pine Madras Prineville Redmond Silver Lake Sunriver Three Rivers What is the current containment status of the wildfire? As of August 26, 2025, the Flat Fire has burned approximately 21,971 acres and is at 7% containment (4). Firefighters have established some initial containment lines, particularly along the southern perimeter, and continue to work aggressively with both ground and aerial resources. However, challenging terrain, dry conditions, and red flag warnings are slowing progress toward containment (2). Are there any evacuation orders or alerts in place? Evacuation orders remain active across parts of Deschutes and Jefferson Counties. Authorities have issued Level 1 (Be Ready), Level 2 (Be Set), and Level 3 (Go Now) evacuation levels, affecting nearly 10,000 people. A 24-hour Red Cross evacuation center has been established at Highland Baptist Church in Redmond, and the Jefferson County Fairgrounds is open for large animal sheltering. Residents are urged to follow updates from county sheriff’s offices and to avoid the fire zone for their safety and to support firefighting operations. Protect yourself from wildfire smokeSee how a wildfire smoke air purifier can help clean your air. LEARN MORE 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. As of August 26, 2025, this fire is 7% contained.","wildfire-map-spotlight-flat-fire-central-oregon","2025-08-26T13:45:00Z",{"_91":648,"_88":649},"https://cdn.shopify.com/s/files/1/0065/4780/0182/articles/SuburbsSmoke1Desktop.jpg?v=1756237547","Smoke behind suburb",{"_68":651,"_540":652,"_610":653,"_612":654,"_614":655,"_616":656,"_556":657},"gid://shopify/Article/563510247561","Wildfire Map Spotlight: Pickett Fire, California","Find out more about the Pickett Fire in Napa County, California.","What is the name and location of the wildfire? As of August 26, 2025, the Pickett Fire is active in Napa County, California, northeast of Calistoga, affecting areas near Pickett Road and the Silverado Trail. The fire has spread across the rugged hillsides of the eastern Napa Valley, impacting areas around Pope Valley and approaching Swartz Canyon and Aetna Springs (1). The blaze is located within a region known for vineyards and wineries, many of which remain at risk (5). Which cities or areas are affected by the Pickett Fire? The cities and areas affected by the Pickett Fire include: Angwin Calistoga Deer Park Larkmead Middletown Napa Pope Valley Santa Rosa Solano County Sonoma County Smoke has further degraded air quality across the North Bay, particularly in Napa, Solano, and Sonoma counties, with visible impacts as far as Santa Rosa (3). What is the current containment status of the Pickett Fire? As of August 26, 2025, the Pickett Fire has burned approximately 6,803 acres and is 17% contained, according to Cal Fire (4). Firefighting crews have made progress by reinforcing fire lines using bulldozers, historical firebreaks, and air support, though the fire remains active in steep and remote terrain. Night-flying helicopters, ground crews, and water tenders continue to be deployed, with more resources expected to arrive to strengthen containment. Are there any evacuation orders or alerts in place? On August 25, Napa County declared a health emergency due to risks to water safety and due to fire-related hazardous waste (6). As of the latest reports, evacuation orders and warnings remain in effect across multiple zones in Napa County. Areas under evacuation orders include: POP-E001-B (south of James Creek and west of Pope Valley Road) NPA-E121-C (upper third of Dutch Henry Canyon Road) NPA-E122-B (north of Freisen Drive) Evacuation warnings remain in place for zones such as NPA-E122-A, POP-E001-A, NPA-E107, NPA-E121-A, NPA-E122, POP-E002-B, and ANG-E001 (5). Temporary shelters have been established, including the Calistoga Community Center and Crosswalk Community Church in Napa, to assist displaced residents (2). Protect yourself from wildfire smokeSee how a wildfire smoke air purifier can help clean your air. LEARN MORE 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. As of August 26, 2025, this fire is 17% contained.","wildfire-map-spotlight-pickett-fire-napa-county-california","2025-08-26T13:40:00Z",{"_91":658,"_88":659},"https://cdn.shopify.com/s/files/1/0065/4780/0182/articles/SuburbsSmoke2Desktop_8c1a7103-8ef0-429f-bd82-66ec481a1d0b.jpg?v=1756236830","Fire behind a house","cta",{"_544":662,"_540":663},"/newsroom?tag=Air%20Quality","all air quality news","productCta",{"_68":666,"_540":667,"_542":668,"_600":670,"_548":671,"_603":702,"_664":-7},"air-monitors","Air Monitors",{"_544":669,"_546":547},"/products/air-quality-monitors",[602],[672,679,688,693],{"_68":673,"_540":674,"_22":675,"_556":676,"_542":678},"airVisualSensors","AirVisual Sensors","World's smartest air monitors",{"_558":677,"_560":677},"/dl/assets/nav/air-monitors/av_series@1x.webp",{"_544":669,"_546":547},{"_68":680,"_540":681,"_22":682,"_556":683,"_542":685},"featuredContributors","Featured Contributors","Learn about our featured data contributors around the world and how they help their communities improve air quality.",{"_558":684,"_560":684},"/dl/assets/nav/air-monitors/featured-contributors.webp",{"_544":686,"_546":547,"_540":687},"/featured-contributors","see contributors",{"_68":593,"_540":594,"_22":595,"_556":689,"_542":691},{"_558":690,"_560":690},"/dl/assets/nav/air-monitors/community.webp",{"_544":599,"_546":547,"_540":692},"our challenge",{"_68":694,"_540":695,"_22":696,"_556":697,"_542":699},"communityMonitoring","Community Monitoring","IQAir AirVisual Platform offers easy and convenient ways to share data and provide critical air quality data globally.",{"_558":698,"_560":698},"/dl/assets/nav/air-monitors/IQAirAirVisualPlatform.webp",{"_544":700,"_546":547,"_540":701},"/community-air-quality-monitoring","find out more",{"_605":703,"_660":750},[704,712,722,731,740],{"_68":705,"_540":706,"_610":25,"_612":707,"_614":708,"_616":709,"_556":710},"gid://shopify/Article/563125911689","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. The takeaway 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","2025-07-30T07:30:00Z",{"_91":711,"_88":-5},"https://cdn.shopify.com/s/files/1/0065/4780/0182/articles/StAndrews_Desk_B_f9b9e850-fd21-4d14-b863-7c6634d3a829.jpg?v=1753943966",{"_68":713,"_540":714,"_610":715,"_612":716,"_614":717,"_616":718,"_556":719},"gid://shopify/Article/560531243145","Celebrating Swiss National Day","Learn what Swiss identity means to IQAir as an international Swiss-born company.","To IQAir, “Swiss Made” is more than a label we affix to our high-performance products. It’s an identity. A nationhood. A symbol of pride. But what is Swiss National Day to IQAir and Switzerland? “Swiss-ness” is a deeply embedded part of IQAir’s identity, as well as the identities of millions of Swiss people. Like IQAir, Switzerland’s almost 9 million residents declare their pride in being Swiss on August 1. What does Swiss National Day celebrate? Swiss National Day, which falls on August 1, memorializes the founding of the Swiss Confederation. In 1291, the territorial districts, or cantons, of Uri, Schwyz, and Unterwalden aligned with each other to present a united front against the growing Habsburg dynasty that ruled neighboring Austria. To formalize the agreement, the Federal Charter of 1291, or Pacte du Rütli, was signed. The country of Switzerland now encompasses 26 cantons situated on almost 16,000 square miles in a mountainous region bordered by Austria, as well as Germany, France, Italy, and Liechtenstein. How is Swiss National Day celebrated? Swiss National Day was first recognized as an official public holiday in Switzerland in 1994. The day mostly centers on local festivities, as the Swiss people are known for their dedication to community. Like most national celebrations around the world, traditional food and drink play a big role in the day’s activities. It often starts with a farmer’s breakfast or brunch with eggs, sausages, rosti (a potato dish) and bread buns, including the traditional Augustweggen – the top of which features a cross reminiscent of the Swiss flag. The Swiss national sausage, cervelat, is the main course for many afternoon and evening barbecues. Cheese is served with every meal. Swiss hard apple cider is often the beverage of choice during, and in between, meals. Throughout the day, citizens enjoy parades, musical events (some featuring yodeling and alphorns), and historical re-creations with citizens bedecked in colorful costumes surrounded by all manner of flags. At night, children take to streets, carrying paper lanterns that bear Switzerland’s red and white cross symbol, and fireworks can be seen and heard throughout the country. More traditional celebrations involve building a bonfire in an elevated spot, recalling Switzerland’s early history and the ongoing strides that led to full independence. Prominent members of a community give speeches about the values of “Swiss-ness,” and what the future promises for the proud citizens of this multicultural, peaceable nation. Swiss National Day is widely regarded as one of the most important holidays in Switzerland. It is a day when the entire nation comes together to celebrate their shared heritage and values. What does being Swiss mean to IQAir? Swiss-ness permeates everything we do at IQAir. It drives our vision, our mission, our processes, and our philosophy We’re dedicated to quality and our international, multicultural community. Explore high-performance air purifiers CLICK HERE From the award-winning HealthPro Series to the elegant, high-performance Atem X air purifier, to the radically inventive AirVisual platform and air quality app, we work tirelessly to ensure that all IQAir technology is at the forefront of our field in quality, innovation, and effectiveness. For IQAir, Swiss National Day is a celebration of our heritage and a commitment to maintaining the highest standards in everything we do. On this celebratory day, as on every day, we are inspired by the values of our Swiss roots.","celebrating-swiss-national-day","2025-07-28T16:00:00Z",{"_91":720,"_88":721},"https://cdn.shopify.com/s/files/1/0065/4780/0182/articles/SwissDay_071322_Desktop_VFIN_aac0f477-b557-4fd2-a597-8db3cb833808.jpg?v=1753718414","Swiss flags hanging on buildings",{"_68":723,"_540":724,"_610":725,"_612":726,"_614":727,"_616":728,"_556":729},"gid://shopify/Article/563054477449","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. The takeaway 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","2025-06-10T07:00:00Z",{"_91":730,"_88":-5},"https://cdn.shopify.com/s/files/1/0065/4780/0182/articles/AQL_QAAirMonitors_Desk_A_82c2df4d-ba49-4106-aed3-5b29c72e5580.jpg?v=1751992026",{"_68":732,"_540":733,"_610":734,"_612":735,"_614":736,"_616":737,"_556":738},"gid://shopify/Article/563054051465","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. Download the 2024 World Air Quality ReportLearn about the state of air quality around the world. DOWNLOAD NOW 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. The takeaway 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","2025-06-03T07:00:06Z",{"_91":739,"_88":-5},"https://cdn.shopify.com/s/files/1/0065/4780/0182/articles/polluted-city-desktop-final_189b730c-9865-41a5-abad-081d127cc656.webp?v=1751480254",{"_68":741,"_540":742,"_610":743,"_612":744,"_614":745,"_616":746,"_556":747},"gid://shopify/Article/562898600073","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. The takeaway 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","2025-05-12T07:00:04Z",{"_91":748,"_88":749},"https://cdn.shopify.com/s/files/1/0065/4780/0182/articles/DefundingAirMonitoringConsequences_Desk_B_e6bc00ec-d0c1-4557-a784-68b004902124.jpg?v=1755079590","Global connection network over earth.",{"_544":751,"_540":752},"/newsroom?tag=Community","All Community News",{"_68":754,"_540":313,"_542":755,"_548":757,"_664":819},"air-purifiers",{"_544":756,"_546":547},"/products/air-purifiers",[758,769,777,785,794,803,811],{"_68":759,"_540":313,"_22":760,"_556":761,"_542":763,"_764":765},"airPurifiers","Shop All of Our High Performance Air Purifiers 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