SmogRank / Countries / Thailand / May 2025

Most polluted cities in Thailand, May 2025

5 cities in Thailand ranked by their average PM2.5 over the 31 days. Worst: Khlong Luang at 21.0 µg/m³, #160 of 2,193 cities in the world. Cleanest: Chiang Mai at 12.6. A city needs measurements on 70% of the days to be ranked.

  1. 1Khlong Luanglow-cost sensorsPathum Thani
    21.0
  2. 2Sai Mailow-cost sensorsBangkok
    18.4
  3. 3Bangkoklow-cost sensorsBangkok
    16.8
  4. 4Bang Pakonglow-cost sensorsChachoengsao
    14.6
  5. 5Chiang Mailow-cost sensorsChiang Mai
    12.6
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, May 2025 · Thailand now