SmogRank / World / Taiwan / Taiwan / January 2025

Most polluted cities in Taiwan, Taiwan, January 2025

35 cities in Taiwan, Taiwan ranked by their average PM2.5 over the 31 days. Worst: Chaozhou at 28.9 µg/m³, #107 of 2,426 cities in the world. Cleanest: Taitung at 9.0. 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.

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

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SmogRank, most polluted cities in Taiwan, Taiwan, PM2.5, January 2025, smogrank.com/tw/region/taiwan/history/2025-01 (accessed 6 Oct 2026).

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