SmogRank / Countries / Thailand / March 2025

Most polluted cities in Thailand, March 2025

4 cities in Thailand ranked by their average PM2.5 over the 31 days. Worst: Chiang Mai at 62.0 µg/m³, #26 of 2,218 cities in the world. Cleanest: Bangkok at 36.6. A city needs measurements on 70% of the days to be ranked.

  1. 1Chiang Mailow-cost sensorsChiang Mai
    62.0
  2. 2Sai Mailow-cost sensorsBangkok
    41.9
  3. 3Bang Pakonglow-cost sensorsChachoengsao
    39.3
  4. 4Bangkoklow-cost sensorsBangkok
    36.6
Good0–9.0
Moderate9.1–35.4
Sensitive groups35.5–55.4
Unhealthy55.5–125.4
Very unhealthy125.5–225.4
Hazardous225.5+

All cities in the world, March 2025 · Thailand now