Air Quality 
Air Monitors
Air Purifiers
For Business
News
Support
2017-2023
World's most polluted cities
Most polluted city ranking based on annual average PM2.5 concentration (μg/m³)
2023
World Air Quality Report
PM2.5 legend
0-5
Meets WHO guideline
5.1-10
Exceeds by 1 to 2 times
10.1-15
Exceeds by 2 to 3 times
15.1-25
Exceeds by 3 to 5 times
25.1-35
Exceeds by 5 to 7 times
35.1-50
Exceeds by 7 to 10 times
>50.1
Exceeds by over 10 times
Rank | City | 2023 | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 |  Changhua, Taiwan | 24.5 | 28.1 | 32.1 | 32.6 | 35.3 | 27.6 | 15.9 | 12.1 | 13.4 | 21.1 | 28.8 | 27.7 | 19.7 | 16.1 | 18.2 | 15.8 | 19.3 | 21.8 | 22.8 |
| 2 | Tainan, Taiwan | 20.9 | 29.8 | 31.7 | 27.1 | 27 | 21.4 | 9.1 | 7.3 | 9.2 | 12.9 | 24.8 | 25.7 | 25.7 | 17.8 | 20.1 | 18.4 | 22.6 | 23.9 | 24.9 |
| 3 | Donggang Township, Taiwan | 20.7 | 31.8 | 32.6 | 30.6 | 25.6 | 18.1 | 11.1 | 10.6 | 10.9 | 14.2 | 19.7 | 24 | 27.3 | -- | -- | -- | -- | -- | -- |
| 4 | Pingtung, Taiwan | 19.8 | 29.7 | 31 | 26.2 | 23 | 17.8 | 8.2 | 7.5 | 10.4 | 13.7 | 19.9 | 25.2 | 24.1 | 17.8 | 18.1 | 17.5 | 19.9 | 21.5 | 23.3 |
| 5 | Kaohsiung, Taiwan | 19.4 | 30.3 | 30.3 | 27.7 | 24.2 | 17.3 | 8 | 7.1 | 8.9 | 10.4 | 19.2 | 24 | 26.4 | 19.4 | 21.6 | 19.8 | 22.7 | 24.4 | 27.7 |
| 6 | Chiayi, Taiwan | 19.2 | 25.1 | 28.5 | 25.5 | 27.3 | 19.6 | 8.8 | 7.6 | 8.3 | 13.1 | 21.1 | 24.1 | 20.9 | -- | -- | -- | -- | -- | -- |
| 7 | Jincheng Township, Taiwan | 19.1 | 24.4 | 25.6 | 27 | 24.9 | 19.1 | 11.2 | 8 | 13 | 10.7 | 17.4 | 21.5 | 26 | -- | -- | -- | -- | -- | -- |
| 8 | Erlin Township, Taiwan | 18.7 | 21.6 | 24.5 | 24.8 | 28.2 | 20.7 | 11.1 | 9.2 | 8.7 | 15.9 | 18.7 | 21.6 | 18.6 | -- | -- | -- | -- | -- | -- |
| 9 | Chaozhou Township, Taiwan | 18.3 | 31.3 | 27.9 | 23.9 | 19.6 | 14.4 | 8.1 | 7.5 | 8.2 | 10 | 17.6 | 25 | 24.3 | -- | -- | -- | -- | -- | -- |
| 10 | Nantou, Taiwan | 18.3 | 25 | 23.6 | 24.5 | 26.1 | 20.7 | 7 | 5.3 | 8 | 16.6 | 20.9 | -- | 19.5 | 14.6 | 19.3 | 17.9 | 20.3 | 22.9 | 26.5 |
| 11 | Xianxi Township, Taiwan | 17.2 | 20.4 | 23 | 22.3 | 25.3 | 20.1 | 13.1 | 12 | 12.4 | 13.2 | 12.4 | 15.5 | 14.4 | -- | -- | -- | -- | -- | -- |
| 12 | Nantou Township, Taiwan | 16.7 | 22.7 | 20.8 | 24.1 | 24.6 | 19.5 | 8.7 | 7.4 | 8.7 | 14.6 | 15.6 | -- | 15.8 | -- | -- | -- | -- | -- | -- |
| 13 | Yunlin, Taiwan | 16.6 | 21.4 | 22.7 | 23.3 | 25.5 | 17.9 | 8.7 | 6.7 | 7.5 | 12.1 | 15.9 | 19.6 | 18.2 | 14 | 18.5 | 17 | 20.5 | 23.9 | 26.6 |
| 14 | Taichung City, Taiwan | 16.3 | 18.1 | 19 | 21.9 | 24 | 18.9 | 10.2 | 8.5 | 9.4 | 14.3 | 17.4 | 18.1 | 16 | -- | -- | -- | -- | -- | -- |
| 15 | Nangan Township, Taiwan | 15.2 | 23.7 | 19.5 | -- | 23.2 | 17.6 | 13.3 | 8.6 | 11.6 | 9.4 | 14.3 | 15.8 | 20.9 | -- | -- | -- | -- | -- | -- |
| 16 | Puli Township, Taiwan | 14.7 | 18.2 | 15.2 | 21.1 | 18.7 | 16 | 6.4 | 4.4 | 7 | 14.3 | 17.3 | 19.7 | 13.4 | -- | -- | -- | -- | -- | -- |
| 17 | Banqiao, Taiwan | 14.1 | 15.6 | 17.3 | 18.3 | 20.3 | 15.6 | 11.5 | 9.1 | 10.1 | 11.4 | 12.2 | 13.8 | 13.5 | 10.5 | -- | -- | -- | -- | -- |
| 18 | Hukou Township, Taiwan | 14.1 | 15.7 | 14.5 | 17.2 | 20.3 | 15 | 9.5 | 8.2 | 8.8 | 13.2 | 14.6 | 15.8 | 16.8 | -- | -- | -- | -- | -- | -- |
| 19 | Miaoli City, Taiwan | 13.9 | 17.7 | 18.6 | 20 | 23.1 | 15.2 | 7.9 | 7.5 | 8.3 | 11.4 | 11.8 | 13.1 | 10.6 | -- | -- | -- | -- | -- | -- |
| 20 | Taoyuan City, Taiwan | 13.5 | 16 | 15.3 | 16.8 | 20.2 | 14.8 | 10.3 | 8.5 | 9.1 | 11 | 11.8 | 13.8 | 14.3 | 8.9 | -- | -- | -- | -- | -- |
| 21 | Hsinchu City, Taiwan | 13.4 | 15.7 | 17 | 16.7 | 20.2 | 14.2 | 8 | 7.3 | 8.6 | 11.6 | 12.1 | 13.6 | 14.9 | -- | -- | -- | -- | -- | -- |
| 22 | Toufen City, Taiwan | 13.2 | 15.2 | 16.8 | 17.7 | 20.2 | 15.4 | 9.6 | 8.1 | 7.6 | 10.7 | 11.3 | 12.5 | 12.5 | -- | -- | -- | -- | -- | -- |
| 23 | Sanyi Township, Taiwan | 13.1 | 13.8 | 12.6 | 18 | 19.7 | 16.2 | 10.3 | 8.2 | 8.1 | -- | -- | -- | 9.6 | -- | -- | -- | -- | -- | -- |
| 24 | Zhudong Township, Taiwan | 12.5 | 14 | 14.2 | 15.8 | 17.3 | 13.7 | 8.5 | 7.9 | 7.9 | 12.7 | 12.3 | 13.6 | 11.8 | -- | -- | -- | -- | -- | -- |
| 25 | Fangliao Township, Taiwan | 12.2 | 20.6 | 18.5 | 15.7 | 14.3 | 9.4 | 6.4 | 6.1 | 9.2 | 6 | 8.8 | 11.9 | 16.3 | -- | -- | -- | -- | -- | -- |
| 26 | Tapei City, Taiwan | 12 | 14.1 | 13.9 | 15.4 | 18.3 | 13.3 | 10.2 | 8.7 | 9.4 | 8.6 | 9.7 | 10.6 | 11.6 | -- | -- | -- | -- | -- | -- |
| 27 | New Tapei City, Taiwan | 11.9 | 13.8 | 13.8 | 15 | 17.9 | 13 | 9.8 | 7.9 | 9.4 | 9.2 | 9.9 | 11.4 | 11.4 | -- | -- | -- | -- | -- | -- |
| 28 | Keelung City, Taiwan | 11.9 | 15 | 12.9 | 14.5 | 17.5 | 14.4 | 10.4 | 7.9 | 9.2 | 8.1 | 10.4 | 10.8 | 11.8 | -- | -- | -- | -- | -- | -- |
| 29 | Penghu, Taiwan | 11.9 | 16.6 | 15.8 | 14.5 | 17.7 | 12.4 | 6.8 | 5.5 | 6.8 | 7.7 | 12.4 | 12.5 | 11.8 | 10.9 | 13.7 | 12.3 | 13.1 | 14.3 | 15.7 |
| 30 | New Tapei City, Taiwan | 11.2 | 14.2 | 12.7 | 14.5 | 17 | 12.9 | 11.1 | 9.2 | 9.4 | 9.4 | 8 | 6.7 | 8 | -- | -- | -- | -- | -- | -- |
| 31 | Yilan Township, Taiwan | 10.2 | 10.8 | 8.5 | 11.7 | 13.9 | 12 | 9.9 | 9.1 | 9.6 | 7.9 | 10.4 | 10.2 | 8.6 | -- | -- | -- | -- | -- | -- |
| 32 | Hualien City, Taiwan | 8.2 | 8.3 | 6 | 10.3 | 13.2 | 10.1 | 7 | 6.1 | 6.9 | 5.9 | 8.4 | 8.6 | 6.9 | -- | -- | -- | -- | -- | -- |
| 33 | Dongshan Township, Taiwan | 7.9 | 9.2 | 7.2 | 9.8 | 12.8 | 8.9 | 6.4 | 5 | 6 | 5.1 | 7.9 | 8.5 | 7.2 | -- | -- | -- | -- | -- | -- |
| 34 | Taitung, Taiwan | 6.7 | 7 | 5.3 | 8.5 | 9.3 | 7.1 | 5.7 | 5.1 | 5.8 | 5.4 | 7 | 7.4 | 5.8 | 5.8 | 7.8 | 7.3 | 8.7 | 9.3 | 9.3 |
| 35 | Guanshan, Taiwan | 6.1 | 8.8 | 4.9 | 7.6 | 9.2 | 5.9 | 5 | 3.9 | 4.3 | 4.3 | 5.7 | 6.6 | 4.9 | -- | -- | -- | -- | -- | -- |
| 36 | Hengchun Township, Taiwan | 5.9 | 6 | 5.1 | 7.1 | 8 | 5.8 | 4.9 | 4.4 | 5.6 | 3.4 | 10.9 | -- | 7.1 | -- | -- | -- | -- | -- | -- |
1-36 of 36
1
Jump to page:
Stay Informed. Download #1 air quality app
Rated 4.8Air pollution forecast, pollution alerts and much more to help you plan your days and keep protected against air pollution
AQI US, Metric