SmogRank / Countries / Thailand / February 2026

Most polluted cities in Thailand, February 2026

6 cities in Thailand ranked by their average PM2.5 over the 28 days. Worst: Khlong Luang at 45.2 µg/m³, #108 of 2,251 cities in the world. Cleanest: Chiang Mai at 32.7. A city needs measurements on 70% of the days to be ranked.

  1. 1Khlong Luanglow-cost sensorsPathum Thani
    45.2
  2. 2Uttaraditlow-cost sensorsUttaradit
    40.8
  3. 3Sai Mailow-cost sensorsBangkok
    40.3
  4. 4Ban Khlong Prawetlow-cost sensorsBangkok
    38.8
  5. 5Bangkoklow-cost sensorsBangkok
    37.6
  6. 6Chiang Mailow-cost sensorsChiang Mai
    32.7
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, February 2026 · Thailand now