SmogRank / World / Thailand / November 2025

Most polluted cities in Thailand, November 2025

4 cities in Thailand ranked by their average PM2.5 over the 30 days. Worst: Bangkok at 26.4 µg/m³, #218 of 2,157 cities in the world. Cleanest: Chiang Mai at 16.7. A city needs measurements on 70% of the days to be ranked.

← Bangkok 26.4
Every city in Thailand ranked for November 2025, one column each, worst on the left and cleanest on the right. Point at it to read a city; tap to open it.
  1. 1BangkokBangkok
    26.4
  2. 2Khlong LuangPathum Thani
    24.9
  3. 3Sai MaiBangkok
    24.2
  4. 4Chiang MaiChiang Mai
    16.7
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, November 2025 · Thailand now

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SmogRank, most polluted cities in Thailand, PM2.5, November 2025, smogrank.com/th/history/2025-11 (accessed 2 Oct 2026).

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