SmogRank / World / Taiwan / Taiwan / September 2025

Most polluted cities in Taiwan, Taiwan, September 2025

37 cities in Taiwan, Taiwan ranked by their average PM2.5 over the 30 days. Worst: Yuanlin at 15.1 µg/m³, #327 of 3,052 cities in the world. Cleanest: Guanshan at 3.0. A city needs measurements on 70% of the days to be ranked.

Ranked by unhealthy days: the share of each city's measured days with a daily mean over 35.4 µg/m³ (US AQI 101+), Unhealthy for Sensitive Groups or worse on the US EPA's scale. Ties go to the higher average.

← Yuanlin 0% 0.75%0
Every city in Taiwan, Taiwan ranked for September 2025, one column each, ranked by unhealthy days: height is the share of its measured days that were unhealthy, colour its average. Point at it to read a city; tap to open it.
  1. 1Yuanlin
    0%
  2. 2Taichung
    0%
  3. 3Erlun
    0%
  4. 4Buzi
    0%
  5. 5Douliu
    0%
  6. 6Changhua
    0%
  7. 7Erlin
    0%
  8. 8Daxi
    0%
  9. 9Nantou
    0%
  10. 10Taibao
    0%
  11. 11Zhongliao
    0%
  12. 12Beigang
    0%
  13. 13Xizhou
    0%
  14. 14Toufen
    0%
  15. 15Zhudong
    0%
  16. 16Yongkang
    0%
  17. 17Zhushan
    0%
  18. 18Chaozhou
    0%
  19. 19Miaoli
    0%
  20. 19Hsinchu
    0%
  21. 21Shenzhen
    0%
  22. 22Tainan
    0%
  23. 22Neili
    0%
  24. 24Xinying
    0%
  25. 24Puli
    0%
  26. 26Chiayi City
    0%
  27. 27Lugu
    0%
  28. 28Taoyuan
    0%
  29. 29Taipei
    0%
  30. 30Yujing
    0%
  31. 31Yilan
    0%
  32. 32Hualien City
    0%
  33. 33Magong
    0%
  34. 33Hengchun
    0%
  35. 35Keelung
    0%
  36. 36Taitung
    0%
  37. 37Guanshan
    0%
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, September 2025 · All cities in Taiwan, September 2025 · Taiwan now

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SmogRank, most polluted cities in Taiwan, Taiwan, PM2.5, September 2025, smogrank.com/tw/region/taiwan/history/2025-09 (accessed 6 Oct 2026).

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