Air Quality Lab — Chiang Mai, Thailand
Air Quality Profile
Chiang Mai reports an annual PM2.5 of 32.6 µg/m³. That's above the EU annual limit of 25 µg/m³ — long-term exposure here carries documented health trade-offs.
Chiang Mai
Thailand
ThailandAnnual Average
PoorWHO annual classification
32.6µg/m³
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
PM2.5
3838 µg/m³ — Unhealthy
3838 µg/m³ — Unhealthy
6464 µg/m³ — Very Unhealthy
4242 µg/m³ — Unhealthy
2626 µg/m³ — Poor
2424 µg/m³ — Moderate
1919 µg/m³ — Moderate
2626 µg/m³ — Poor
2121 µg/m³ — Moderate
2727 µg/m³ — Poor
3131 µg/m³ — Poor
3535 µg/m³ — Poor
Jan
Feb
Mar
Apr
May
Jun
3838 µg/m³ — Unhealthy
3838 µg/m³ — Unhealthy
6464 µg/m³ — Very Unhealthy
4242 µg/m³ — Unhealthy
2626 µg/m³ — Poor
2424 µg/m³ — Moderate
Jul
Aug
Sep
Oct
Nov
Dec
1919 µg/m³ — Moderate
2626 µg/m³ — Poor
2121 µg/m³ — Moderate
2727 µg/m³ — Poor
3131 µg/m³ — Poor
3535 µg/m³ — Poor
Best months: Jun–Jul, SepWorst months: Jan, Mar–Apr
Moderate15–25 µg/m³Poor25–35 µg/m³Unhealthy35–50 µg/m³Very Unhealthy50–75 µg/m³
Based on WUSTL PM2.5 dataset (2020–2024) · WHO 2021 thresholds
Confidence: ●●●
How air quality compares
Compared across Thailand
Chiang Mai: 32.6 µg/m³. Typical range in Thailand: 21.3–28.9 µg/m³. Low anchor: Phuket, 15.1 µg/m³. High anchor: Chiang Rai, 33.0 µg/m³.
202 cities tracked