SmogRank / Countries / Thailand / October 2025
Most polluted cities in Thailand, October 2025
5 cities in Thailand ranked by their average PM2.5 over the 31 days. Worst: Khlong Luang at 19.5 µg/m³, #216 of 2,110 cities in the world. Cleanest: Bang Pakong at 13.4. A city needs measurements on 70% of the days to be ranked.
- 1Khlong Luanglow-cost sensorsPathum Thani 19.5
- 2Bangkoklow-cost sensorsBangkok 18.0
- 3Sai Mailow-cost sensorsBangkok 17.4
- 4Chiang Mailow-cost sensorsChiang Mai 15.0
- 5Bang Pakonglow-cost sensorsChachoengsao 13.4
Good0–9.0
Moderate9.1–35.4
Sensitive groups35.5–55.4
Unhealthy55.5–125.4
Very unhealthy125.5–225.4
Hazardous225.5+