Is the air quality good in Chiang Mai?
As of April 16, 2026, 2:30 PM (local time, GMT+7) Chiang Mai is experiencing poor air quality, with the Air Quality Index exceeding 150, placing conditions in the unhealthy range.
Elevated PM2.5 concentrations are the primary pollutant, contributing to dense haze and reduced visibility across the region.
Air quality conditions can change rapidly throughout the day. For a complete, real-time view of current pollution levels, see Chiang Mai’s air quality map.
While pollution levels are currently elevated, long-term data suggest more moderate conditions overall. In 2025, Chiang Mai recorded an average PM2.5 concentration of 18.2 µg/m³, equivalent to an AQI of 63, placing it in the Moderate category and 3.6 times above the WHO annual guideline of 5 µg/m³.
Chiang Mai, Thailand, ranked among the most polluted major cities globally, as of April 16, 2026, at 2:30 PM. Source: IQAir.
Air quality map of Chiang Mai, Thailand, as of April 16, 2026, at 2:30 PM. Source: IQAir.
When will the air quality improve in Chiang Mai?
Short-term improvements depend largely on weather changes. Stronger winds and rainfall can help disperse accumulated pollutants and reduce PM2.5 concentrations. However, during the late dry season in northern Thailand, air quality often remains poor due to persistent haze and limited atmospheric mixing. Pollution levels may continue to fluctuate in the coming days, with more noticeable improvement expected only when consistent rainfall arrives and regional burning activity declines (1).
Hourly air quality forecast for Chiang Mai, Thailand, as of April 16, 2026, at 2:30 PM. Source: IQAir.
What is causing poor air quality in Chiang Mai?
Air pollution in Chiang Mai is primarily driven by seasonal biomass burning across northern Thailand and neighboring countries. Agricultural burning, forest fires, and land clearing release large volumes of smoke and fine particulate matter, which can travel long distances and accumulate over the region (2).
Local sources also contribute to the problem. Vehicle emissions, urban activities, and small-scale industries add to PM2.5 levels, especially in densely populated areas. The region’s mountainous geography further exacerbates pollution by trapping air masses and limiting dispersion (3).
Dry season conditions, including low wind speeds and minimal rainfall, allow pollutants to build up and persist, leading to recurring haze episodes each year.
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.
