What is the air quality in Chiang Mai?

Chiang Mai, Thailand has an annual US AQI of 87 (Polluted) and average PM2.5 of 28.5 µg/m³, ranking #4128 of 5856 cities. Main pollutant: PM2.5.

What is the cleanest month in Chiang Mai?

August is typically the cleanest month (AQI 55) and March the most polluted (AQI 155).

Where does Chiang Mai's air quality data come from?

PM2.5: 1998–2026 (monitors 2011–2026, low-cost sensors 2026, satellite 1998–2011, 2013–2015; 2026 provisional). Measured by government monitoring stations. Full sources are on the methodology page.

Chiang Mai, Thailand — Air Quality & Clean City Guide 2026

Chiang Mai Air Quality Data

Global rank	City	Continent	AQI	PM2.5
4128	Chiang Mai, Thailand	Asia	AQI 87	PM2.5 28.5 µg/m³