SmogRank / Countries / Thailand / March 2026

Most polluted cities in Thailand, March 2026

7 cities in Thailand ranked by their average PM2.5 over the 31 days. Worst: Chiang Mai at 60.3 µg/m³, #36 of 2,332 cities in the world. Cleanest: Bang Pakong at 30.6. A city needs measurements on 70% of the days to be ranked.

  1. 1Chiang Mailow-cost sensorsChiang Mai
    60.3
  2. 2Uttaraditlow-cost sensorsUttaradit
    52.5
  3. 3Khlong Luanglow-cost sensorsPathum Thani
    37.5
  4. 4Sai Mailow-cost sensorsBangkok
    32.9
  5. 5Ban Khlong Prawetlow-cost sensorsBangkok
    32.6
  6. 6Bangkoklow-cost sensorsBangkok
    31.0
  7. 7Bang Pakonglow-cost sensorsChachoengsao
    30.6
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 2026 · Thailand now