SmogRank / World / Taiwan / Taiwan / December 2025

Most polluted cities in Taiwan, Taiwan, December 2025

37 cities in Taiwan, Taiwan ranked by their average PM2.5 over the 31 days. Worst: Douliu at 24.7 µg/m³, #370 of 2,960 cities in the world. Cleanest: Hengchun at 6.2. 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.

← Tainan 10% 9%0
Every city in Taiwan, Taiwan ranked for December 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. 1Tainan
    10%
  2. 2Yongkang
    6%
  3. 3Douliu
    3%
  4. 4Erlun
    3%
  5. 5Chiayi City
    3%
  6. 6Zhushan
    3%
  7. 7Beigang
    3%
  8. 8Chaozhou
    0%
  9. 9Xinying
    0%
  10. 10Yuanlin
    0%
  11. 11Nantou
    0%
  12. 12Taibao
    0%
  13. 13Puli
    0%
  14. 14Erlin
    0%
  15. 15Yujing
    0%
  16. 16Changhua
    0%
  17. 17Taichung
    0%
  18. 18Zhongliao
    0%
  19. 19Magong
    0%
  20. 20Lugu
    0%
  21. 21Buzi
    0%
  22. 21Neili
    0%
  23. 23Miaoli
    0%
  24. 24Xizhou
    0%
  25. 25Toufen
    0%
  26. 26Taipei
    0%
  27. 27Keelung
    0%
  28. 28Taoyuan
    0%
  29. 29Shenzhen
    0%
  30. 30Hsinchu
    0%
  31. 31Daxi
    0%
  32. 32Zhudong
    0%
  33. 33Yilan
    0%
  34. 34Taitung
    0%
  35. 35Guanshan
    0%
  36. 36Hualien City
    0%
  37. 37Hengchun
    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, December 2025 · All cities in Taiwan, December 2025 · Taiwan now

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SmogRank, most polluted cities in Taiwan, Taiwan, PM2.5, December 2025, smogrank.com/tw/region/taiwan/history/2025-12 (accessed 7 Oct 2026).

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