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 |  Cheonan, South Korea | 26.5 | 35.8 | 46.9 | 36.4 | 26.7 | 23.3 | 23.3 | 18.8 | 18.7 | 16.7 | 20.9 | 21.5 | 30.1 | 30.3 | 28.1 | 23.9 | 29.4 | 25.4 | 27.7 |
| 2 | Asan, South Korea | 25.5 | 34.3 | 45.7 | 35.8 | 26.6 | 22.6 | 22.1 | 18.1 | 17.6 | 16.2 | 20.1 | 20 | 28.3 | 28.3 | 27.4 | 25.1 | 31 | 26 | 26.8 |
| 3 | Pyeongtaek, South Korea | 25 | 31.3 | 35 | 32.6 | 24 | 24.7 | 26.2 | 21.4 | 20.1 | 19.8 | 23.8 | 19.2 | 23 | -- | -- | -- | -- | -- | -- |
| 4 | Pyeongtaek, South Korea | 24.6 | 31.4 | 38.8 | 35 | 26.9 | 23.4 | 22.7 | 19.2 | 16.4 | 16 | 21.2 | 19.6 | 25.3 | 23.2 | 22.8 | 21.7 | 29.4 | 29.5 | 33.1 |
| 5 | Yeoju, South Korea | 24.5 | 31.3 | 37.8 | 36.8 | 23.8 | 22.2 | 22.8 | 17.9 | 14.8 | 15.5 | 22.1 | 24 | 26.7 | 20.8 | 20.4 | -- | 31.3 | 27.2 | 28.4 |
| 6 | Seosan, South Korea | 23.4 | 30.9 | 40.9 | 32 | 25.5 | 22.6 | 20 | 17.3 | 16.8 | 16.4 | 15.8 | 17.2 | 26.5 | 25.8 | 25.4 | 18.9 | 21.5 | 18.7 | 19.8 |
| 7 | Icheon, South Korea | 22.8 | 32.8 | 34.4 | 32.1 | 22.2 | 21.4 | 20.8 | 16.9 | 14.3 | 14.1 | 19.8 | 21.7 | 24.1 | 24.3 | 21.5 | -- | 29.9 | 29.4 | 28.6 |
| 8 | Inje-gun, South Korea | 22.5 | 26.9 | 36.1 | 37.4 | 27.6 | 19.9 | 17.2 | 21.2 | 13.3 | 13.5 | 13.4 | 20.4 | 23.1 | 23 | -- | -- | -- | -- | -- |
| 9 | Siheung, South Korea | 22.4 | 28.3 | 32.5 | 32.2 | 23.6 | 23.4 | 21.5 | 19.3 | 15.3 | 14.6 | 19.1 | 18.8 | 21.9 | 20.5 | 22.2 | 20 | 30.6 | 28.7 | 26.6 |
| 10 | Anseong, South Korea | 22.3 | 32.7 | 40.2 | 35.4 | 21.1 | 19 | 15.7 | 14.1 | 13.4 | 12 | 20 | 20.8 | 25.3 | 22.3 | 20.2 | -- | 31.6 | 30.4 | 29.8 |
| 11 | Gwangju, South Korea | 22.2 | 26.3 | 37.6 | 30.9 | 22.3 | 18.4 | 18.6 | 15.5 | 17.4 | 15.5 | 18.1 | 19.8 | 26.4 | 21 | 19.2 | 17.8 | 23.8 | -- | -- |
| 12 | Gokseong, South Korea | 22.2 | 19.6 | 35.6 | 35.8 | 20.4 | 21.5 | 19.8 | 20 | 20.6 | 21 | 13.8 | 16.7 | 17 | -- | -- | -- | -- | -- | -- |
| 13 | Dangjin, South Korea | 22.1 | 32 | 38.6 | 33.2 | 28.5 | 22.7 | 18.9 | 16 | 15 | 15.6 | 13.5 | 12.8 | 19.9 | 20.8 | 22 | -- | 31.7 | 25.7 | 24.6 |
| 14 | Hwaseong, South Korea | 21.8 | 28.8 | 34.1 | 31.2 | 21.2 | 21 | 20.3 | 17.1 | 14.5 | 14.7 | 19.6 | 19.1 | 21.6 | 21 | 21.8 | 22.5 | 29.1 | 26.7 | 25.4 |
| 15 | Gongju, South Korea | 21.6 | 26.2 | 36.6 | 30.7 | 27.5 | 19.9 | 17.6 | 14.5 | 15.6 | 12.8 | 17.6 | 17.8 | 24.1 | 20.1 | 19.3 | -- | 26.6 | -- | -- |
| 16 | Gimpo, South Korea | 21.6 | 28.2 | 32 | 31 | 22.4 | 21.7 | 21.4 | 18.6 | 13.3 | 13.3 | 18 | 18.6 | 21.6 | 20.1 | 22.4 | 20.9 | 26.6 | 24 | 28.4 |
| 17 | Seocheon, South Korea | 21.4 | 26.2 | 34.5 | 30.2 | 27.7 | 18.3 | 15.9 | 11 | 13.5 | 12.5 | 19.3 | 20.9 | 29.4 | -- | -- | -- | -- | -- | -- |
| 18 | Yesan, South Korea | 21.3 | 28.7 | 34.3 | 27.3 | 23 | 18.8 | 19.3 | 14.5 | 14.2 | 14.2 | 18.3 | 18.2 | 26.4 | 21 | 20.8 | -- | 30.4 | -- | -- |
| 19 | Yongin, South Korea | 20.8 | 31.4 | 35.7 | 33.3 | 18 | 17.9 | 15.9 | 14.1 | 12.7 | 11.5 | 16.3 | 19.3 | 24.6 | 19.6 | 20.5 | 21.4 | 25.2 | 24.8 | 28.1 |
| 20 | Cheongyang, South Korea | 20.5 | 29.1 | 40.9 | 27.5 | 23.2 | 16.4 | 16.7 | 12.8 | 14.2 | 10.4 | 14.8 | 17.4 | 24.6 | 19 | 19.3 | -- | 29.5 | -- | -- |
| 21 | Gwangmyeong, South Korea | 20.5 | 29.8 | 34.7 | 32.2 | 20.5 | 19.2 | 16.5 | 14.6 | 13.6 | 12.3 | 15.7 | 18.2 | 20.4 | 20.2 | 21.3 | -- | 26.9 | 25.2 | 27.1 |
| 22 | Anyang, South Korea | 20.3 | 25.9 | 32.8 | 32.2 | 20.9 | 19.5 | 18 | 15.1 | 12.6 | 12.8 | 17.8 | 18.5 | 19.5 | 19.8 | 19.7 | 21.9 | 25.4 | 27.1 | 23.7 |
| 23 | Osan, South Korea | 20.3 | 27 | 33.6 | 30.2 | 19.7 | 18.1 | 17.3 | 14.5 | 14.9 | 13.7 | 18.6 | 17.4 | 19.9 | 22.6 | 23 | 22.8 | 28.2 | 27.8 | 28.8 |
| 24 | Gunpo, South Korea | 20.2 | 24.3 | 29.3 | 29.4 | 20.1 | 20.2 | 20.1 | 17.3 | 13.2 | 13.2 | 18.5 | 18.2 | 19.4 | 18.3 | 19.9 | -- | 25.5 | 26.6 | 27.2 |
| 25 | Jangseong, South Korea | 20.2 | 24.7 | 33.5 | 28.9 | 20.7 | 18.6 | 17.8 | 14 | 15.7 | 14.1 | 14.5 | 16.3 | 23.7 | 24.2 | 23.9 | 25.2 | 28.3 | -- | -- |
| 26 | Gwangju, South Korea | 20.1 | 30.6 | 34.4 | 31.8 | 17.4 | 17.6 | 15.9 | 13.5 | 11.8 | 11.1 | 16.4 | 19.3 | 21.6 | 20 | 19.8 | -- | 28.7 | 27.8 | 29.6 |
| 27 | Yangju, South Korea | 20.1 | 29.2 | 32.3 | 29.9 | 21.1 | 19 | 17.3 | 16.2 | 11.6 | 11.4 | 15.6 | 17.8 | 21.2 | 19.4 | 19 | -- | 27.4 | 28.6 | 32.5 |
| 28 | Goyang, South Korea | 20 | 25.9 | 29.1 | 29 | 19.6 | 19.5 | 18.5 | 18.3 | 15.7 | 13.7 | 16.9 | 16.7 | 18.3 | 19.1 | 20.7 | 20.2 | 24.9 | 25.2 | 26.7 |
| 29 | Ulsan, South Korea | 20 | 25.5 | 26.5 | 27.5 | 21.9 | 21.3 | 20.1 | 17.8 | 15.1 | 13.2 | 17.9 | 16 | 17.2 | -- | -- | -- | -- | -- | -- |
| 30 | Boryeong, South Korea | 19.7 | 25.9 | 34.3 | 27 | 24 | 17.6 | 15.7 | 12.3 | 14.2 | 12.3 | 15.2 | 16.8 | 22.4 | 22.3 | 22.6 | -- | 25 | -- | -- |
| 31 | Hongseong, South Korea | 19.7 | 25.4 | 33.9 | 27.9 | 23.4 | 16.7 | 15.9 | 13.3 | 13.1 | 12.6 | 15.3 | 15.7 | 26.7 | 19.4 | 20.2 | -- | 28.6 | -- | -- |
| 32 | Wonju, South Korea | 19.7 | 28.6 | 31.9 | 29.4 | 20.5 | 17.5 | 14.5 | 12.1 | 12.7 | 11.3 | 17.3 | 20.5 | 22.9 | 17.8 | 17.4 | 18.4 | 27.7 | 29.6 | 31.4 |
| 33 | Pocheon, South Korea | 19.7 | 30.6 | 34.1 | 30.4 | 16.8 | 15.5 | 14.2 | 14 | 11.7 | 10.6 | 16.8 | 18.9 | 23.1 | 18.2 | 18.8 | -- | 24.9 | 23.6 | 26.8 |
| 34 | Yangpyeong, South Korea | 19.7 | 29.3 | 33.2 | 30.7 | 17.4 | 16.4 | 14.4 | 13 | 10.7 | 9.4 | 16 | 21.5 | 24.7 | 18.8 | 18.8 | -- | 25.4 | 23.8 | 27.6 |
| 35 | Incheon, South Korea | 19.7 | -- | -- | 38.5 | 24 | 21.2 | 18.2 | 18 | 15 | 13.6 | 17.4 | 19.1 | 23.7 | 18.7 | 19.9 | 17.7 | 22.8 | -- | -- |
| 36 | Seoul, South Korea | 19.7 | 25.3 | 29.9 | 30.2 | 21.5 | 18.3 | 17 | 16.4 | 12.9 | 11.2 | 15 | 17 | 21.8 | 18.3 | 19.7 | 20.9 | 24.8 | 23.3 | 25.2 |
| 37 | Guri, South Korea | 19.6 | 24.4 | 27.4 | 28.3 | 18.9 | 18.4 | 18.8 | 18.1 | 14.4 | 12.9 | 16.8 | 18.4 | 19 | 18.4 | 19.2 | 19.8 | 26.6 | 24.3 | 29.6 |
| 38 | Buyeo, South Korea | 19.5 | 21.3 | 30.9 | 31.8 | 23.8 | 17.5 | 15.8 | 12.9 | 15.3 | 12.7 | 16.9 | 17.2 | 21.6 | 18.7 | 22.7 | -- | 25.7 | -- | -- |
| 39 | Geumsan, South Korea | 19.5 | 26.6 | 32.7 | 30.6 | 22.8 | 16.1 | 14.7 | 12.2 | 13.4 | 12.8 | 15.9 | 16 | 23.7 | 17.7 | 18.5 | 21.1 | 24.5 | -- | -- |
| 40 | Suwon, South Korea | 19.5 | 27.5 | 32.5 | 29.5 | 17.7 | 18.1 | 15.8 | 14.6 | 13.2 | 11.7 | 16.1 | 17.3 | 20.9 | 18.2 | 19.5 | 21 | 25.5 | 23.6 | 25.8 |
| 41 | Hongcheon, South Korea | 19 | 30.8 | 30.9 | 28.4 | 18.3 | 16 | 14.3 | 13.5 | 10 | 9.7 | 12.8 | -- | 28.2 | 17.2 | -- | -- | -- | -- | -- |
| 42 | Taean, South Korea | 18.9 | 23.7 | 29.4 | 25 | 24.1 | 18.1 | 14.4 | 12.5 | 11.8 | 13 | 14.5 | 17.3 | 23.9 | 18.4 | 20.4 | 17.1 | 21.6 | -- | -- |
| 43 | Incheon, South Korea | 18.7 | -- | -- | 37.9 | 24.7 | 21.7 | 18.2 | 16.9 | 13.1 | 11.9 | 15.4 | 17.5 | 22.4 | -- | -- | -- | -- | -- | -- |
| 44 | Bucheon, South Korea | 18.6 | 25.5 | 31.1 | 31.6 | 18.6 | 18.5 | 15.3 | 12.5 | 9.7 | 9.2 | 15.3 | 17.3 | 20.2 | 17.4 | 21.9 | 20.9 | 30.8 | 27.3 | 25.6 |
| 45 | Namyangju, South Korea | 18.5 | 26 | 30.4 | 29.4 | 17.6 | 17.2 | 15.7 | 14.8 | 11.5 | 9.9 | 14 | 17 | 20 | 17.7 | 17.8 | 20.1 | 24.8 | 23.9 | -- |
| 46 | Paju, South Korea | 18.3 | 29 | 32 | 25.6 | 14.8 | 14.9 | 14 | 13.9 | 10.9 | 10.4 | 14.8 | 17.7 | 21.3 | 19.7 | 22.1 | -- | 27.9 | 25.1 | 29 |
| 47 | Gwacheon, South Korea | 18.1 | 24.7 | 30.8 | 27.9 | 19.6 | 16.3 | 14.9 | 13.8 | 11.9 | 10.5 | 13.1 | 15.6 | 18.8 | 18.8 | 18.9 | 21.5 | 26.1 | 23.2 | 24.2 |
| 48 | Nonsan, South Korea | 18 | 19.9 | 24.9 | 23.6 | 22.9 | 16.3 | 14.8 | 11.7 | 13.4 | 11 | 15.6 | 18.7 | 25.4 | 18.6 | 18.2 | -- | 23.5 | -- | -- |
| 49 | Daegu, South Korea | 18 | 24.1 | 27.4 | 25.4 | 19.8 | 16.7 | 14.1 | 14.1 | 10.3 | 9.3 | 14.3 | 17.9 | 22.7 | 16.7 | 17.8 | 19.8 | 22.1 | -- | -- |
| 50 | Gapyeong, South Korea | 18 | 27.8 | 30.3 | 29.1 | 17.3 | 15.7 | 13.2 | 12.5 | 10 | 9.1 | 13.4 | 17.8 | 21.1 | 17.8 | 16.2 | -- | 22.4 | 23 | 22.1 |
1-50 of 84
1
2
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