2017-2023
World's most polluted cities
The most polluted cities according to data aggregated from over 80,000 data points.
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 |  Happy Camp, USA | 16.8 | 9.9 | 17.4 | 13.3 | 5.3 | 4.5 | 4.7 | 14.1 | 65.4 | 43 | 6.2 | 18.2 | 16.6 | 9.6 | 18.8 | 28 | 13 | -- | -- |
| 2 | Baldwin Park, USA | 15.3 | 16.1 | 11.9 | 13.4 | 21.2 | 14.4 | 16.8 | 25.3 | 16.3 | 7 | 11.7 | 12.1 | 18 | 17.8 | 18.8 | -- | -- | -- | -- |
| 3 | Ridgewood, USA | 15.3 | 3.3 | 4.8 | 4.8 | 3.7 | 4.5 | 5.3 | 6.3 | 6.5 | 7.3 | 7.1 | 114.7 | 5.3 | 7.8 | -- | -- | -- | -- | -- |
| 4 | Cutler, USA | 14.9 | 14.9 | 17.5 | 8.9 | 14.2 | 9.7 | 12.8 | 15.4 | 16 | 16.6 | 14.6 | 17.8 | 25.6 | 15.3 | 24.7 | -- | -- | -- | -- |
| 5 | Salton City, USA | 14.9 | 5.2 | 18.6 | 22.7 | 36 | 32.9 | 21.7 | 8.9 | 6.3 | 10.9 | 5.4 | 6.1 | 6.9 | 8.5 | 6.8 | -- | -- | -- | -- |
| 6 | Orleans, USA | 14.7 | 6 | 7.1 | 5 | 3.3 | 3.7 | 4.7 | 11.7 | 63.7 | 51.3 | 6 | 7.4 | 4.6 | 8.3 | 19.6 | 20.8 | 8.2 | -- | -- |
| 7 | North El Monte, USA | 14.4 | 8.4 | 7.5 | 9.1 | -- | 19.9 | 15.3 | 21.2 | 15.5 | 20.4 | 10.9 | 4.9 | -- | 14.3 | 15.6 | -- | -- | -- | -- |
| 8 | Willowbrook, USA | 14.4 | 12.7 | 11.5 | 9.2 | 15.4 | 11.2 | 10.1 | 16.6 | 14.1 | 16 | 15.1 | 16 | 24.1 | 12.7 | -- | -- | -- | -- | -- |
| 9 | Willow Creek, USA | 14.1 | 12.1 | 16.7 | 9.1 | 5.2 | 4.7 | 4.1 | 11.7 | 52.1 | 23.3 | 6.9 | 14.5 | 8.8 | 20.2 | 21.5 | -- | -- | -- | -- |
| 10 | San Bernardino, USA | 14 | 6.8 | 8.1 | 10.6 | 18.4 | 17.8 | 18.9 | 19.2 | 13.3 | 21.1 | 10.5 | 9.2 | 14.4 | 13 | 14.1 | -- | -- | -- | -- |
| 11 | Bloomington, USA | 13.8 | 7.2 | 7.9 | 11 | 18.6 | 17.3 | 17.8 | 19 | 13.3 | 20.5 | 10.3 | 8.8 | 13.1 | 14.4 | -- | -- | -- | -- | -- |
| 12 | San Gabriel, USA | 13.5 | 8.9 | 7.9 | 8.4 | 18.3 | 15.2 | 14.9 | 20.7 | 15.2 | 19.4 | 10.7 | 8.8 | 12.7 | 13.4 | 16.3 | 17.3 | 14.2 | -- | -- |
| 13 | La Habra, USA | 13.4 | 8.6 | 8.6 | 7.9 | 15.5 | 12.9 | 13.6 | 20.4 | 16.5 | 19.2 | 13.4 | 9.8 | 13.9 | 13.3 | 18.2 | -- | -- | -- | -- |
| 14 | Ontario, USA | 13.4 | 7.8 | 8.1 | 8.5 | 15.2 | 12.8 | 15 | 20.1 | 14.3 | 18.4 | 13.6 | 10.6 | 15.2 | 15.1 | 18.8 | 17.6 | 16 | -- | -- |
| 15 | Bell, USA | 13.3 | 10.9 | 11 | 8.2 | 16.5 | 12.2 | 11.1 | 18.2 | 15 | 17 | 12 | 11.3 | 16 | 12.5 | 15.7 | 17.3 | -- | -- | -- |
| 16 | Diamond Bar, USA | 13.3 | 7.3 | 14.1 | 9 | 16.6 | 14.9 | 15.9 | 18.1 | 13 | 18.8 | 9.9 | 9.2 | 13.1 | 12.5 | 16.1 | 17.5 | 16 | -- | -- |
| 17 | Riverdale, USA | 13.3 | 29.2 | 14.6 | 6.7 | 6.6 | 5.5 | 6.9 | 8.4 | 12.4 | 12.5 | 11 | 18.2 | 27.1 | 15.5 | -- | -- | -- | -- | -- |
| 18 | Hanford, USA | 13 | 14.9 | 16.5 | 6.8 | 7.3 | 6.5 | 8.7 | 10.4 | 11.6 | 12.3 | 13.7 | 20.8 | 27 | 14.8 | 15.4 | 20.4 | -- | -- | -- |
| 19 | Pomona, USA | 12.9 | 8.9 | 7.6 | 8.7 | 16.2 | 14.3 | 15.9 | 19.9 | 13.7 | 19.7 | 9.5 | 8.4 | 12.3 | 13 | 15.8 | 17 | 14.5 | -- | -- |
| 20 | Yreka, USA | 12.8 | 9.2 | 8.9 | 5.5 | 3.3 | 4.4 | 4.4 | 9.8 | 49.2 | 27.6 | 5.9 | 10.4 | 14.4 | 11.2 | 16.9 | 12.2 | 7.8 | -- | -- |
| 21 | Exeter, USA | 12.7 | 13.5 | 16.8 | 6.9 | 10.8 | 7.4 | 9.6 | 10.3 | 13.4 | 15.2 | 12 | 14.8 | 21.8 | 14.8 | 22.1 | -- | -- | -- | -- |
| 22 | Easton, USA | 12.5 | 11.8 | 11.8 | 4.4 | 8.2 | 9 | 10.8 | 11.7 | 11.1 | 12.4 | 14 | 18.7 | 25.4 | -- | -- | -- | -- | -- | -- |
| 23 | Orange, USA | 12.5 | 5.7 | 5.5 | 6.9 | 13.2 | 11.9 | 12.7 | 21.1 | 17.8 | 20.5 | 13.5 | 8 | 11.3 | 11.2 | 10.7 | 10.2 | -- | -- | -- |
| 24 | Visalia, USA | 12.4 | 11.8 | 11.6 | 5.7 | 9.7 | 8 | 9.1 | 12.6 | 11.5 | 12.6 | 12.2 | 18.1 | 25 | 16.2 | 20.9 | 23.5 | 12.8 | 17.6 | 16.8 |
| 25 | Compton, USA | 12.3 | 12.6 | 11.3 | 8 | 12.7 | 8.5 | 8.7 | 15.8 | 13.2 | 16.2 | 11.8 | 12.6 | 16.7 | 14.2 | 15.4 | 18 | 15.7 | -- | -- |
| 26 | Cypress, USA | 12.2 | 9.2 | 7.8 | 8.5 | 14.2 | 11.3 | 8.4 | 14 | 12.5 | 18.3 | 15.1 | 11.7 | 14.8 | 10.9 | 27.2 | -- | -- | -- | -- |
| 27 | Grenada, USA | 12.2 | 9.3 | 10.4 | 7.1 | 3.9 | 4.3 | 4.4 | 9.3 | 43.1 | 21 | 6.4 | 10.5 | 15.5 | 10.9 | 21.2 | 18.1 | -- | -- | -- |
| 28 | Highland, USA | 12.2 | 3.8 | 5 | 9.3 | 16.4 | 18.9 | 19.6 | 17 | 11.2 | 20.1 | 8.1 | 6.6 | 8.7 | 10.6 | 13.7 | 14.4 | 13.8 | -- | -- |
| 29 | Buena Park, USA | 12.1 | 10.9 | 9.9 | 8 | 13.1 | 8.9 | 9.7 | 16.6 | 14 | 16.2 | 11.1 | 10.3 | 15.5 | 13.5 | 15 | -- | -- | -- | -- |
| 30 | Fontana, USA | 12.1 | 5.8 | 6.1 | 9.2 | 16.1 | 15.5 | 16.2 | 17.5 | 11.8 | 18.9 | 9.2 | 8.1 | 10.5 | 12.1 | 16.2 | -- | -- | -- | -- |
| 31 | Colton, USA | 12 | 5.6 | 6.1 | 8.2 | 15.4 | 15.7 | 17.6 | 16.3 | 11.2 | 18.6 | 10.2 | 8.1 | 10.7 | 12.1 | 14.5 | -- | 16.1 | -- | -- |
| 32 | Norwalk, USA | 12 | 10.3 | 10 | 7.8 | 13.3 | 9.8 | 10.3 | 16.8 | 13.5 | 16 | 11 | 10.4 | 14.1 | 13.2 | 15.5 | -- | -- | -- | -- |
| 33 | Shafter, USA | 11.9 | -- | -- | 6.1 | 7.8 | 6.1 | 7.4 | 9.8 | 12.4 | 13.8 | 9.9 | 16.4 | 25.6 | 12.4 | 19.3 | 21.9 | 10.7 | -- | -- |
| 34 | Tuolumne, USA | 11.9 | 16.7 | 19.9 | 13.2 | 10 | 7 | 7.2 | 7.6 | 7.3 | 12.1 | 16.2 | 13.9 | 12.4 | 16.7 | 13.7 | 25.3 | 12.5 | -- | -- |
| 35 | West Covina, USA | 11.9 | 7.4 | 7.4 | 7.5 | 15 | 12 | 13 | 18.7 | 13.9 | 17.3 | 10.4 | 8.7 | 9.7 | 12.4 | 16.4 | 17.9 | 13.8 | -- | -- |
| 36 | Hacienda Heights, USA | 11.7 | 4.5 | 5 | 6.4 | 14.5 | 15.8 | 16.7 | 18.1 | 12.1 | 19.2 | 10 | 7.6 | 9.8 | 10.2 | 14.7 | 15.3 | 13 | -- | -- |
| 37 | La Mirada, USA | 11.7 | 9.4 | 8.2 | 5.2 | 12.5 | 9.4 | 10.5 | 17.3 | 14.5 | 16.9 | 11.6 | 9.8 | 14.4 | 12 | 13.5 | 13.4 | 13.5 | 16 | -- |
| 38 | Montague, USA | 11.7 | 8.8 | 10.5 | 6.6 | 3.2 | 4.6 | 4.9 | 9.9 | 40.6 | 19 | 6 | 10.4 | 14.1 | 10.6 | 21.8 | 17.8 | 10.9 | -- | -- |
| 39 | San Marino, USA | 11.7 | 6.4 | 6 | 7.5 | 16.7 | 14.4 | 14.3 | 19.7 | 14.3 | -- | 7.7 | 7.5 | 10.2 | 12 | 12.5 | 16 | 14.5 | -- | -- |
| 40 | Alhambra, USA | 11.6 | 7.1 | 6.3 | 6.9 | 15.2 | 12.6 | 12.1 | 17.7 | 13.3 | 17.1 | 10.2 | 8.3 | 11.8 | 11.8 | 14.8 | 15.9 | 14.4 | -- | -- |
| 41 | Lathrop, USA | 11.6 | 10.5 | 13.1 | 22.7 | -- | -- | 9 | 10.1 | 11.2 | 13.7 | 7.4 | 8.6 | 13.7 | 10.6 | 15.5 | -- | -- | -- | -- |
| 42 | Miramonte, USA | 11.6 | 1.6 | 3 | 1.7 | -- | -- | 5.5 | 6.4 | 5.9 | 8.3 | 50.3 | 22.7 | 2.5 | 6.8 | 13.4 | 17.1 | -- | -- | -- |
| 43 | Monrovia, USA | 11.6 | 5.5 | 5.1 | 6.5 | 15.8 | 14 | 14.6 | 19.1 | 13.5 | 19.2 | 9 | 7 | 9.5 | 11.7 | 14.7 | -- | -- | -- | -- |
| 44 | Signal Hill, USA | 11.6 | 9.2 | 8.5 | 7.1 | 13 | 8.6 | 8.4 | 16.7 | 14.4 | 16.2 | 11.1 | 10.7 | 14.7 | 12.1 | 15.2 | -- | -- | -- | -- |
| 45 | Yucaipa, USA | 11.6 | 9.7 | 11.7 | 13.6 | 13.8 | 17.5 | 18.7 | 12.3 | 7.3 | 15.8 | 7 | 6 | 6.7 | 11 | 13.2 | -- | -- | -- | -- |
| 46 | Glendale, USA | 11.5 | 5.2 | 5 | 6.4 | 15.8 | 14.2 | 14.3 | 18.1 | 13.4 | 19 | 9.1 | 7.6 | 9.8 | 11.3 | 13.9 | 16.5 | 13.6 | -- | -- |
| 47 | Loma Linda, USA | 11.5 | 3.5 | 4.7 | 8.4 | 15.5 | 16.7 | 17.4 | 16.2 | 10.6 | 19.5 | 7.9 | 6.5 | 9 | 9.8 | 14.1 | -- | -- | -- | -- |
| 48 | Pasadena, USA | 11.5 | 5.4 | 5.2 | 6.6 | 15.9 | 14.5 | 14.8 | 19.1 | 13 | 18.6 | 8.8 | 6.7 | 9.3 | 11.4 | 13.9 | 16.2 | 13.5 | -- | -- |
| 49 | Riverside, USA | 11.4 | 5.1 | 6.1 | 7.5 | 14.3 | 13.5 | 13.9 | 16.6 | 11.2 | 18.1 | 9.4 | 8.8 | 12.6 | 11 | 14.2 | 14.4 | 12.4 | 12.8 | 13.8 |
| 50 | West Carson, USA | 11.4 | 11.1 | 9.8 | 7 | 12.4 | 8.5 | 8.6 | 15.7 | 13.7 | 14.7 | 10.7 | 10.9 | 14 | 11.9 | 17.9 | -- | -- | -- | -- |
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