SmogRank / World / Thailand / April 2026

Most polluted cities in Thailand, April 2026

7 cities in Thailand ranked by their average PM2.5 over the 30 days. Worst: Chiang Mai at 97.0 µg/m³, #2 of 2,277 cities in the world. Cleanest: Bang Pakong at 31.2. A city needs measurements on 70% of the days to be ranked.

← Chiang Mai 97.0
Every city in Thailand ranked for April 2026, one column each, worst on the left and cleanest on the right. Point at it to read a city; tap to open it.
  1. 1Chiang MaiChiang Mai
    180
  2. 2UttaraditUttaradit
    165
  3. 3Khlong LuangPathum Thani
    108
  4. 4Sai MaiBangkok
    98
  5. 5Ban Khlong PrawetBangkok
    96
  6. 6BangkokBangkok
    94
  7. 7Bang Pakonglow-cost sensorsChachoengsao
    92
Good0–50
Moderate51–100
Sensitive groups101–150
Unhealthy151–200
Very unhealthy201–300
Hazardous301+

The US EPA's Air Quality Index for PM2.5 (2024 breakpoints). Show values as: µg/m³ · US AQI · India AQI · China AQI · European AQI · UK DAQI · Canada AQHI+. About the scales

All cities in the world, April 2026 · Thailand now

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SmogRank, most polluted cities in Thailand, PM2.5, April 2026, smogrank.com/th/history/2026-04 (accessed 2 Oct 2026).

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