SmogRank / Countries / Thailand / August 2026

Most polluted cities in Thailand, August 2026

7 cities in Thailand ranked by their average PM2.5 over the 31 days. Worst: Chiang Mai at 9.6 µg/m³, #698 of 2,312 cities in the world. Cleanest: Sai Mai at 3.3. A city needs measurements on 70% of the days to be ranked.

  1. 1Chiang Mailow-cost sensorsChiang Mai
    9.6
  2. 2Uttaraditlow-cost sensorsUttaradit
    8.2
  3. 3Khlong Luanglow-cost sensorsPathum Thani
    5.9
  4. 4Bangkoklow-cost sensorsBangkok
    5.6
  5. 5Ban Khlong Prawetlow-cost sensorsBangkok
    3.7
  6. 6Bang Pakonglow-cost sensorsChachoengsao
    3.3
  7. 6Sai Mailow-cost sensorsBangkok
    3.3
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, August 2026 · Thailand now