SmogRank / Countries / Thailand / 2024
Most polluted cities in Thailand, 2024
3 cities in Thailand ranked by their average PM2.5 over the 366 days; 3 above the WHO annual guideline (5.0 µg/m³). Worst: Chiang Mai at 34.9 µg/m³, #26 of 1,686 cities in the world. Cleanest: Tha Bo at 25.0. A city needs measurements on 70% of the days to be ranked.
- 1Chiang Mailow-cost sensorsChiang Mai 34.97.0×
- 2Bangkoklow-cost sensorsBangkok 26.15.2×
- 3Tha BoNong Khai 25.05.0×
Good0–9.0
Moderate9.1–35.4
Sensitive groups35.5–55.4
Unhealthy55.5–125.4
Very unhealthy125.5–225.4
Hazardous225.5+