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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 |  Tay Ho, Vietnam | 61.5 | 117.2 | 80.7 | 88.4 | 72.2 | 43.6 | 33.3 | 26.4 | 38.6 | 41.5 | 50 | 72.5 | 74.6 | -- | -- | -- | -- | -- | -- |
| 2 | Hoan Kiem, Vietnam | 50.2 | 86.8 | 73.2 | 59 | 44.5 | 35.6 | 32.8 | 29.5 | 33 | 37.2 | 51 | 74.1 | 62.7 | -- | -- | -- | -- | -- | -- |
| 3 | Hanoi, Vietnam | 43.7 | 73.8 | 46.1 | 54.4 | 47.3 | 33.8 | 27 | 22 | 28.2 | 30.8 | 40.7 | 58.6 | 61.3 | 40.1 | 36.2 | 37.9 | 46.9 | 40.8 | 45.8 |
| 4 | Ho, Vietnam | 37.4 | 31.4 | 38.2 | 29.2 | 28.7 | 30.1 | 33 | 31.8 | 39 | 43.9 | 46.1 | 55 | 41.8 | 32.4 | 38 | -- | -- | -- | -- |
| 5 | Neo, Vietnam | 35.4 | 53 | 37.3 | 24.4 | 26.1 | 25.9 | 25 | 32.2 | 32.3 | 37.7 | 40.7 | 50.2 | 43.2 | 10.7 | 43.6 | -- | -- | -- | -- |
| 6 | Nhu Quynh, Vietnam | 35.3 | 18.6 | 21.6 | 29.2 | 21.7 | 22.5 | 18 | 42 | 44.1 | 42.2 | 53.6 | 77.4 | 40.6 | 8.7 | 23 | -- | -- | -- | -- |
| 7 | Thua, Vietnam | 35.1 | 53.4 | 41.3 | 32.5 | 23 | 28.6 | 24.8 | 28.5 | 35.9 | 36.9 | 39.6 | 42.3 | 34.5 | 27.3 | 45.6 | -- | -- | -- | -- |
| 8 | Haiphong, Vietnam | 28.7 | -- | -- | -- | 47.3 | 26.4 | 16.7 | 15.6 | 17 | 20.6 | 28.3 | 43.2 | 45.6 | -- | -- | -- | -- | -- | -- |
| 9 | Bien Hoa, Vietnam | 28 | 26.3 | 34.3 | 34.1 | 27.7 | 33.5 | 26 | 23.5 | 23.9 | 23.6 | 28.8 | 29.3 | 24.4 | -- | -- | -- | -- | -- | -- |
| 10 | Ho Chi Minh City, Vietnam | 21.8 | 21.1 | 24.8 | 24.1 | 26.4 | 19.8 | 15.5 | 15.5 | 14.8 | 17.1 | 26.3 | 31.9 | 24.4 | 21.2 | 19.4 | 22 | 25.3 | 26.9 | 23.6 |
| 11 | Da Nang, Vietnam | 20 | 23.4 | 25.4 | 31.3 | 36.2 | 22.5 | 13.9 | 11.2 | 12.7 | 14 | 14.5 | 18.4 | 15.2 | 18.8 | 14.1 | 14.8 | 25.9 | -- | -- |
| 12 | Cao Bang, Vietnam | 18.7 | 33.3 | 34.2 | 26.3 | 19.1 | 12.6 | 8.3 | 9.9 | 10.1 | 16 | 19.1 | 19.4 | 12.5 | -- | -- | -- | -- | -- | -- |
| 13 | Hoi An, Vietnam | 18.5 | -- | -- | -- | -- | 22.4 | 14.6 | 12.8 | 17.6 | 20.5 | 15.8 | 22.3 | 23.1 | -- | -- | -- | -- | -- | -- |
| 14 | Thanh Pho Ba Ria, Vietnam | 14.3 | -- | -- | 17.4 | 21.6 | 15.2 | 11.2 | 11 | 10.9 | 9.8 | 12.9 | 17.7 | 17.6 | -- | -- | -- | -- | -- | -- |
| 15 | Tra Vinh, Vietnam | 5.6 | -- | 5.9 | 6.2 | 6.1 | 5.7 | 4.6 | 5.5 | 6.2 | 5.7 | 5.1 | 5.5 | 5.2 | 5.5 | 6.2 | -- | -- | -- | -- |
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