SmogRank / Countries / Thailand / September 2026

Most polluted cities in Thailand, September 2026

7 cities in Thailand ranked by their average PM2.5 over the 30 days. Worst: Khlong Luang at 11.9 µg/m³, #312 of 2,332 cities in the world. Cleanest: Uttaradit at 8.0. A city needs measurements on 70% of the days to be ranked.

  1. 1Khlong Luanglow-cost sensorsPathum Thani
    11.9
  2. 2Chiang Mailow-cost sensorsChiang Mai
    11.1
  3. 3Bangkoklow-cost sensorsBangkok
    10.7
  4. 4Bang Pakonglow-cost sensorsChachoengsao
    10.0
  5. 5Ban Khlong Prawetlow-cost sensorsBangkok
    9.5
  6. 6Sai Mailow-cost sensorsBangkok
    9.2
  7. 7Uttaraditlow-cost sensorsUttaradit
    8.0
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, September 2026 · Thailand now

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SmogRank, most polluted cities in Thailand, PM2.5, September 2026, smogrank.com/th/history/2026-09 (accessed 2 Oct 2026).

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