SmogRank / World / Asia / Taiwan / Taiwan

Most polluted cities in Taiwan, Taiwan

36 measured cities, this year; 36 above the WHO annual guideline. Worst: Douliu at 16.8 µg/m³, #466 in the world.

About 34.8K people in these 6 cities breathed unhealthy air on an average day so far this year.

Ranked by people: each city's population times its share of unhealthy days, those with a daily mean over 35.4 µg/m³ (US AQI 101+). That is how many people living there breathed unhealthy air on an average day. Only cities measured at 2 or more places at least 3 km apart are ranked: one monitor shouldn't speak for a whole city. Population is the city itself, not its wider metro area.

Taiwan: 36 measured citiesTakao: 2 measured citiesTaipei: 4 measured cities#36 Hengchun: 7.0 µg/m³#35 Guanshan: 7.3 µg/m³#34 Hualien City: 7.8 µg/m³#33 Taitung: 8.0 µg/m³#32 Yilan: 9.6 µg/m³#31 Keelung: 10.1 µg/m³#30 Zhudong: 10.8 µg/m³#29 Toufen: 11.1 µg/m³#28 Magong: 11.2 µg/m³#26 Hsinchu: 11.3 µg/m³#27 Taoyuan: 11.3 µg/m³#24 Shenzhen: 11.5 µg/m³#25 Xizhou: 11.5 µg/m³#23 Taipei: 11.8 µg/m³#22 Daxi: 12.0 µg/m³#21 Miaoli: 12.1 µg/m³#20 Lugu: 12.2 µg/m³#19 Neili: 12.7 µg/m³#18 Taichung: 13.4 µg/m³#17 Changhua: 13.5 µg/m³#16 Buzi: 13.6 µg/m³#15 Zhongliao: 13.7 µg/m³#13 Taibao: 13.8 µg/m³#14 Puli: 13.8 µg/m³#12 Chaozhou: 14.4 µg/m³#11 Xinying: 14.6 µg/m³#9 Nantou: 14.8 µg/m³#10 Erlin: 14.8 µg/m³#8 Yongkang: 15.1 µg/m³#7 Tainan: 15.3 µg/m³#5 Beigang: 15.4 µg/m³#6 Zhushan: 15.4 µg/m³#4 Chiayi City: 15.5 µg/m³#3 Yuanlin: 16.1 µg/m³#2 Erlun: 16.4 µg/m³#1 Douliu: 16.8 µg/m³
Each dot is a measured city, coloured by its PM2.5; tap a dot to open the city.
← Tainan 33.9K 30K0
Every measured city in Taiwan, Taiwan with monitors in two or more places, one column each, ranked by people breathing unhealthy air: height is people on an average day, colour its average. Point at it to read a city; tap to open it.
  1. 1Tainan 33.9K
  2. 2Erlin 481
  3. 3Neili 412
  4. 4Taichung 0
  5. 5Taipei 0
  6. 6Shenzhen 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

Estimated: cities without a monitor

Taiwan cities we can't measure, with model estimates for the last 7 days. Listed by population, not ranked: estimates aren't precise enough to rank. Model estimates from the Copernicus Atmosphere Monitoring Service (CAMS), adjusted to measured cities nearby where there are any. Adjusted, a single day lands within ×1.5 of what a monitor would read about two times in three; unadjusted, it can be off by half or double. Treat them as a guide, not a measurement.

City7-day estimateBand
Neihu≈ 13 µg/m³Moderate
Chang-hua≈ 13 µg/m³Moderate
Zhubei≈ 14 µg/m³Moderate
Bade≈ 14 µg/m³Moderate
Caotun≈ 23 µg/m³Moderate
Wufeng≈ 23 µg/m³Moderate
Xihu≈ 13 µg/m³Moderate
Donggang≈ 10 µg/m³Moderate
Xiluo≈ 15 µg/m³Moderate
Shetou≈ 13 µg/m³Moderate
Yongjing≈ 13 µg/m³Moderate
Tianzhong≈ 13 µg/m³Moderate
Beidou≈ 13 µg/m³Moderate
Xingang≈ 15 µg/m³Moderate
Pitou≈ 13 µg/m³Moderate
Tianwei≈ 13 µg/m³Moderate
Zhongxing New Village≈ 23 µg/m³Moderate
Citong≈ 15 µg/m³Moderate
Budai≈ 10 µg/m³Moderate
Xiulin≈ 6 µg/m³Good
Linnei≈ 13 µg/m³Moderate
Yujing≈ 13 µg/m³Moderate

Bad-air episodes in Taiwan

Times when many cities around here had PM2.5 at twice their usual or more on the same days.

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SmogRank, most polluted cities in Taiwan, Taiwan, PM2.5, this year to 6 Oct 2026, 22:00 UTC, smogrank.com/tw/region/taiwan?w=year.

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You're welcome to reuse a single chart, image or figure with this citation and a link. Terms. Raw monitor readings in bulk are published by OpenAQ, under each provider's licence.

Updated 2026-10-06 22:07 UTC. Values are PM2.5 (fine particles), the median of each city's monitors, as the US AQI PM2.5 sub-index.