SmogRank / Countries / Thailand / April 2025
Most polluted cities in Thailand, April 2025
4 cities in Thailand ranked by their average PM2.5 over the 30 days. Worst: Chiang Mai at 35.4 µg/m³, #86 of 2,286 cities in the world. Cleanest: Bang Pakong at 21.7. A city needs measurements on 70% of the days to be ranked.
- 1Chiang Mailow-cost sensorsChiang Mai 35.4
- 2Sai Mailow-cost sensorsBangkok 26.4
- 3Bangkoklow-cost sensorsBangkok 22.0
- 4Bang Pakonglow-cost sensorsChachoengsao 21.7
Good0–9.0
Moderate9.1–35.4
Sensitive groups35.5–55.4
Unhealthy55.5–125.4
Very unhealthy125.5–225.4
Hazardous225.5+