2017-2025
World's most polluted cities
The most polluted cities according to data aggregated from over 80,000 data points.
2025
World Air Quality Report
2025
World Air Quality Report
PM2.5 legend
0-5Meets WHO guideline
5.1-10Exceeds by 1 to 2 times
10.1-15Exceeds by 2 to 3 times
15.1-25Exceeds by 3 to 5 times
25.1-35Exceeds by 5 to 7 times
35.1-50Exceeds by 7 to 10 times
>50.1Exceeds by over 10 times
| Rank | City | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 |
|---|---|---|---|---|---|---|---|---|---|---|
| 8867 |  Meadow Vista USA | 4.1 | 4.9 | 5.8 | 8.9 | 13.1 | 17 | 7.2 | -- | -- |
| 8868 | Nicasio USA | 4.1 | 3.7 | 4.6 | 5.4 | -- | -- | -- | -- | -- |
| 8869 | Ocotillo USA | 4.1 | 4.5 | 4.6 | 5 | -- | -- | -- | -- | -- |
| 8870 | Pioneer USA | 4.1 | 3.9 | 5.6 | 6 | 12.8 | 17.2 | 6.5 | -- | -- |
| 8871 | Ross USA | 4.1 | 4.1 | 5.2 | 6.1 | 7.1 | -- | -- | -- | -- |
| 8872 | San Anselmo USA | 4.1 | 4 | 4.9 | 6.2 | 7.3 | 10.5 | 5.7 | -- | -- |
| 8873 | San Bruno USA | 4.1 | 3.7 | 5.4 | 7.1 | 7.7 | 9.5 | 5.8 | -- | -- |
| 8874 | Santa Clara USA | 4.1 | 4.8 | 6.3 | 8.6 | 8.8 | 12.1 | 7.5 | -- | -- |
| 8875 | Saratoga USA | 4.1 | 3.7 | 4.8 | 5.5 | 6.8 | 9.9 | 5.9 | -- | -- |
| 8876 | Tamalpais-Homestead Valley USA | 4.1 | 3.8 | 5 | 6.1 | 7 | -- | -- | -- | -- |
| 8877 | Temelec USA | 4.1 | 4 | 6.1 | 11.6 | 8.5 | -- | -- | -- | -- |
| 8878 | Weitchpec USA | 4.1 | 5.1 | -- | -- | -- | -- | -- | -- | -- |
| 8879 | Teller USA | 4.1 | -- | -- | -- | -- | -- | -- | -- | -- |
| 8880 | Ridge Wood Heights USA | 4.1 | 4.1 | 7.2 | 6.8 | 7.2 | -- | -- | -- | -- |
| 8881 | Brandywine USA | 4.1 | 4 | 8.4 | 8.7 | 4.2 | -- | -- | -- | -- |
| 8882 | Acton USA | 4.1 | 4.7 | 8.8 | 8.1 | 9.3 | -- | -- | -- | -- |
| 8883 | Harrisburg USA | 4.1 | 5.8 | 3.2 | -- | -- | -- | -- | -- | -- |
| 8884 | Goldfield USA | 4.1 | 4.2 | 2.7 | 1.8 | 11.2 | -- | -- | -- | -- |
| 8885 | Zephyr Cove USA | 4.1 | 4 | 4.4 | 6.2 | -- | -- | -- | -- | -- |
| 8886 | Barrington USA | 4.1 | 3.2 | 7.5 | 5.1 | 9.1 | -- | -- | -- | -- |
| 8887 | Conway USA | 4.1 | 3.4 | 7 | -- | -- | -- | -- | -- | -- |
| 8888 | Edgewood USA | 4.1 | 4.5 | 3.4 | 2.2 | 5.7 | -- | -- | -- | -- |
| 8889 | Whitehouse USA | 4.1 | 3.8 | 11.6 | 8.4 | 11.3 | -- | -- | -- | -- |
| 8890 | Corvallis USA | 4.1 | 3.9 | 5.5 | 7.4 | 5 | 10.4 | 5.8 | 5.9 | 6.2 |
| 8891 | Crater Lake USA | 4.1 | 6.1 | 8 | 7.3 | -- | -- | -- | -- | -- |
| 8892 | Harney USA | 4.1 | 5.7 | -- | -- | -- | -- | -- | -- | -- |
| 8893 | Klamath USA | 4.1 | 7.3 | 10 | 3.3 | 19.1 | -- | -- | -- | -- |
| 8894 | Fairview USA | 4.1 | 3.7 | 3.2 | -- | -- | -- | -- | -- | -- |
| 8895 | Price USA | 4.1 | 3.7 | 3.6 | 5.1 | 9.2 | -- | -- | -- | -- |
| 8896 | Silver Summit USA | 4.1 | 4.7 | 3.6 | 3.3 | 10.1 | -- | -- | -- | -- |
| 8897 | Summit Park USA | 4.1 | 4.6 | 3.6 | 2.8 | 8.9 | -- | -- | -- | -- |
| 8898 | Wendover USA | 4.1 | 3.7 | 3.5 | 3 | 12 | -- | -- | -- | -- |
| 8899 | Black Diamond USA | 4.1 | 2.7 | 5.2 | 8.7 | 5.2 | -- | -- | -- | -- |
| 8900 | Burien USA | 4.1 | 4.1 | 5.7 | 8.9 | 6.3 | 9.1 | 8.5 | -- | -- |
| 8901 | Chehalis USA | 4.1 | 4.6 | 5.7 | 6.6 | 5.8 | -- | 5.9 | 7.5 | -- |
| 8902 | Des Moines USA | 4.1 | 3.9 | 6.2 | 10 | 7.4 | -- | -- | -- | -- |
| 8903 | DuPont USA | 4.1 | 3.8 | 6.4 | -- | -- | -- | -- | -- | -- |
| 8904 | Esperance USA | 4.1 | 4.4 | 7.1 | -- | -- | -- | -- | -- | -- |
| 8905 | Fall City USA | 4.1 | 3.4 | 5 | 8 | 6.6 | -- | -- | -- | -- |
| 8906 | Gig Harbor USA | 4.1 | 4 | 5.6 | 8.5 | -- | -- | -- | -- | -- |
| 8907 | Kirkland USA | 4.1 | 3.7 | 5.2 | 8.5 | 5.5 | 8.4 | 6.8 | -- | -- |
| 8908 | Redmond USA | 4.1 | 3.7 | 5.1 | 8.7 | 4.6 | 6.6 | 5.7 | -- | -- |
| 8909 | Sammamish USA | 4.1 | 3.4 | 4.8 | 8.9 | 5.3 | 8.5 | 6.1 | -- | -- |
| 8910 | Yarrow Point USA | 4.1 | 3.6 | 5.4 | 8.5 | 5 | -- | -- | -- | -- |
| 8911 | Casper USA | 4.1 | 5.2 | 4 | 3.8 | 5.4 | 4 | -- | -- | -- |
| 8912 |  Macquarie Australia | 4 | 3.7 | -- | -- | -- | -- | -- | -- | -- |
| 8913 | Bowral Australia | 4 | -- | -- | -- | -- | -- | -- | -- | -- |
| 8914 | Millthorpe Australia | 4 | 3.9 | 3.9 | -- | -- | -- | -- | -- | -- |
| 8915 | Castlemaine Australia | 4 | 4.3 | 5.2 | 4.3 | 8.8 | -- | -- | -- | -- |
| 8916 | McKinnon Australia | 4 | 4.7 | 4.6 | 4.8 | 4.3 | 9.8 | 7.2 | -- | -- |
