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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2851 |  Knik-Fairview, USA | 3.3 | 2.6 | 3.8 | 2.5 | 2.1 | 2 | 1.9 | 2.4 | 4.8 | 2.8 | 4.8 | 3.5 | 4 | 2.9 | -- | -- | -- | -- | -- |
| 2852 | Flagstaff, USA | 3.3 | 1.7 | 2.3 | 2.2 | 2.1 | 2.1 | 3.2 | 3.6 | 3.5 | 4.3 | 4.8 | 5.7 | 3.7 | 1.9 | 6.5 | -- | -- | -- | -- |
| 2853 | Kealakekua, USA | 3.3 | 8.3 | 4.1 | 2.7 | 2.5 | 2.6 | 3.8 | 2.5 | 2.6 | 5.6 | 2.3 | 1.6 | 1.7 | 4.3 | 4.4 | -- | 3.4 | 10.5 | 9.7 |
| 2854 | Ivins, USA | 3.3 | 2.7 | 2.7 | 2.8 | 1.8 | 2 | 2.2 | 3.4 | 3.1 | 3.3 | 4.5 | 4.4 | 4.4 | 1.9 | 7.7 | -- | -- | -- | -- |
| 2855 | Saint George, USA | 3.3 | 1.5 | 3.9 | 2 | 1.8 | 2.6 | 2.8 | 3.2 | 2.7 | 3 | 4.8 | 6.1 | 4.7 | 1.9 | 5 | 5.1 | -- | -- | -- |
| 2856 | Marana, USA | 3.2 | 1.9 | 2.3 | 1.7 | 2.5 | 2.2 | 2.8 | 3.3 | 2.9 | 3.3 | 4.5 | 5.7 | 4.8 | 2.6 | 4.3 | -- | -- | -- | -- |
| 2857 | Breckenridge, USA | 3.2 | 1.8 | 5.7 | 2.1 | 1.7 | 4.8 | 2.3 | 3.8 | 3.6 | 2.7 | 3.2 | 3.3 | 3.3 | 2.6 | 10.5 | -- | -- | -- | -- |
| 2858 | Granby, USA | 3.2 | 1.4 | 2.2 | 2 | 2 | 6.7 | 2.3 | 5.2 | 4.3 | 3.2 | 3.2 | 2.7 | 2.3 | 3.3 | 9.7 | -- | -- | -- | -- |
| 2859 | Vail, USA | 3.2 | 2.7 | 3.3 | 2.9 | 1.9 | 3.9 | 2.1 | 4.2 | 3.6 | 3.2 | 2.9 | 3.7 | 3.7 | 2.9 | 7.8 | -- | -- | -- | -- |
| 2860 | Dillon, USA | 3.2 | 1.3 | 0.7 | 1.9 | 3 | 7 | 3 | 6.2 | 5.5 | 3.1 | 2.2 | 2.3 | 1.4 | 8.2 | 10 | 8.6 | 4.7 | -- | -- |
| 2861 | Neah Bay, USA | 3.2 | 3.1 | 3.3 | 2.7 | 1.9 | 2.9 | 2.2 | 2.9 | 6.3 | 3.8 | 2.9 | 4 | 2.1 | 3.1 | 3.1 | -- | 3.4 | 4.7 | 6.4 |
| 2862 | Valdez, USA | 3.1 | 2.7 | 2.6 | 2.4 | 2 | 2.5 | 2.6 | 3.3 | 5.2 | 2.9 | 3.6 | 3.5 | 0.5 | 3.2 | 5 | -- | -- | -- | -- |
| 2863 | Fruita, USA | 3.1 | 2.8 | 3.9 | 2 | 2 | 2.9 | 1.9 | 2.8 | 3.5 | 2 | 4.4 | 5 | 4.9 | 3.1 | 7.8 | 8.2 | 4.1 | -- | -- |
| 2864 | Hermosa, USA | 3.1 | 3.6 | 4.7 | 1.8 | 1.4 | 2.4 | 2.1 | 2.6 | 3.3 | 2.3 | 3.7 | 4.4 | 3.7 | 2.1 | -- | -- | -- | -- | -- |
| 2865 | Kukio, USA | 3.1 | 10.7 | 3.7 | 2.7 | 1.3 | 1.8 | 3.2 | 1.7 | 1.1 | 1.4 | 2 | 2.4 | 2.3 | 2.4 | -- | -- | -- | -- | -- |
| 2866 | West Yellowstone, USA | 3.1 | 1.3 | 2.3 | 2.3 | 2.6 | 5.4 | 3.2 | 4.5 | 4.8 | 4.1 | 3.4 | 2.7 | 0.7 | 4 | 6.7 | 5.8 | -- | -- | -- |
| 2867 | Santa Clara, USA | 3.1 | 2 | 2.1 | 2.4 | 2.5 | 3.6 | 3.2 | 3.3 | 2.9 | 3.2 | 4.1 | 4.1 | 3.9 | 2 | 5 | 5.5 | -- | -- | -- |
| 2868 | Gakona, USA | 3 | 1.9 | 3.2 | 2.4 | 2.3 | 1.9 | 1.5 | 6.6 | 8 | 1.8 | 2.2 | 1.7 | 2.1 | 2.4 | -- | -- | -- | -- | -- |
| 2869 | Hackberry, USA | 3 | 1.4 | 1.6 | 2.1 | 2.2 | 2.4 | 2.8 | 2.8 | 2.7 | 2.3 | 4.9 | 4.9 | 4.3 | 1.7 | -- | -- | -- | -- | -- |
| 2870 | Prescott, USA | 3 | 1.1 | 1.4 | 1.3 | 2.1 | 1.6 | 2.2 | 3.2 | 2.9 | 2.8 | 5.3 | 5.1 | 3.8 | 1.9 | 4.5 | -- | -- | -- | -- |
| 2871 | Prescott Valley, USA | 3 | 1 | 1 | 1.7 | 1.9 | 1.7 | 2.1 | 2.7 | 2.8 | 2.8 | 5.7 | 5.9 | 4.2 | 1.5 | -- | -- | -- | -- | -- |
| 2872 | Alamosa, USA | 3 | 1.1 | 3.8 | 1.5 | 1.6 | 2.2 | 2.7 | 3.9 | 4.4 | 3.4 | 3.7 | 5.1 | -- | 2.2 | 6.3 | -- | -- | -- | -- |
| 2873 | Basalt, USA | 3 | 1.7 | 1.9 | 2 | 2.3 | 3.5 | 2.4 | 4.4 | 4.2 | 3.4 | 2.9 | 3.4 | 2.8 | 2.6 | 7.1 | -- | -- | -- | -- |
| 2874 | Carbondale, USA | 3 | 2.8 | 2.5 | 2.2 | 2.2 | 3.6 | 2.6 | 3.4 | 3.4 | 2.8 | 3 | 3.6 | 3.6 | 2.8 | 7.2 | 8.2 | 3.9 | -- | -- |
| 2875 | Edwards, USA | 3 | 1.8 | 2.4 | 1.9 | 2.1 | 3.8 | 2.2 | 4.6 | 3.8 | 3.1 | 3.1 | 3.6 | 3.1 | 2.5 | 7.3 | 6.9 | -- | -- | -- |
| 2876 | Glenwood Springs, USA | 3 | 1.7 | 2.3 | 2.1 | 2.2 | 3.4 | 2.8 | 4.5 | 4.2 | 3.2 | 3.1 | 3.3 | 2.3 | 2.5 | -- | -- | -- | -- | -- |
| 2877 | Keystone, USA | 3 | 1.5 | 2.8 | 2.5 | 1.8 | 4.7 | 2.1 | 4.5 | 3.7 | 2.5 | 2.7 | 3.2 | 2.8 | 2.7 | 8.5 | -- | -- | -- | -- |
| 2878 | Palisade, USA | 3 | 2.8 | 4 | 1.8 | 1.7 | 2.9 | 2 | 3 | 3.3 | 2.8 | 3.3 | 4.2 | 3.8 | 2.9 | 7.2 | 8.2 | 3.3 | -- | -- |
| 2879 | Kailua Kona, USA | 3 | 10.1 | 4 | 1.9 | 1.3 | 1.4 | 3.9 | 2 | 1.6 | 5.5 | 1.6 | 1.5 | 1.5 | 5.5 | 5.2 | 2.6 | 1.9 | 11.1 | -- |
| 2880 | Placitas, USA | 3 | 2.1 | 1.9 | 1.9 | 2.1 | 3.5 | 3.9 | 3.6 | 2.4 | 2.4 | 4 | 4.2 | 3.8 | 2.9 | -- | -- | -- | -- | -- |
| 2881 | Wolf Creek, USA | 3 | 0.8 | 4 | 1.7 | 2 | 5 | 2.3 | 3.9 | 4.6 | 2.2 | 3 | 3.3 | 2.9 | 2.2 | 11.1 | -- | -- | -- | -- |
| 2882 | Anchorage, USA | 2.9 | 3.8 | 3.1 | 3.6 | 2.3 | 2.1 | 1.8 | 2.2 | 4.1 | 2.4 | 4 | 2.6 | 3 | 3.3 | 4.7 | 5.1 | 8.1 | 5.9 | 6.5 |
| 2883 | Sierra Vista, USA | 2.9 | 0.7 | 0.9 | 2 | 1.6 | 1.9 | 5.5 | 2.8 | 2.4 | 3.2 | 3.9 | 3.7 | 4.1 | 1.5 | 4.6 | -- | -- | -- | -- |
| 2884 | Beaver Creek, USA | 2.9 | 2.2 | 2.4 | 3 | 1.9 | 4 | 2.1 | 4 | 3.5 | 2.9 | 2.6 | 2.9 | 3.3 | 3.1 | -- | -- | -- | -- | -- |
| 2885 | Creasted Butte, USA | 2.9 | 0.4 | 1.4 | 1.3 | 1.5 | 2.9 | 1.9 | 3.9 | 3.7 | 3.7 | 2.5 | 3.2 | 2.8 | 1.9 | -- | -- | -- | -- | -- |
| 2886 | Santa Fe, USA | 2.9 | 1.5 | 1.9 | 1.8 | 1.7 | 3.2 | 3.3 | 3.2 | 3.4 | 2.6 | 3.8 | 4.5 | 3.6 | 2.8 | 5 | 4.7 | 3.4 | 3.7 | -- |
| 2887 | Quinault, USA | 2.9 | 0.3 | 0.9 | 3.7 | 2 | 2.8 | 2.5 | 2.8 | 8 | 4.9 | 2 | 0.9 | 0.7 | 2.8 | -- | -- | -- | -- | -- |
| 2888 | Haines, USA | 2.8 | 1.9 | 2.1 | 3.1 | 3.3 | 2.4 | 2.1 | 5.6 | 7.5 | 1.5 | 1.9 | 0.9 | 0.7 | 2.9 | 5 | -- | -- | -- | -- |
| 2889 | Aspen, USA | 2.8 | 1.7 | 2.8 | 2.4 | 2.5 | 3.3 | 2.1 | 3.7 | 3.8 | 3 | 2.8 | 3.3 | 2.6 | 2.5 | 5.9 | 6.3 | 3.9 | -- | -- |
| 2890 | El Jebel, USA | 2.8 | 1.8 | 2.3 | 1.6 | 1.7 | 3 | 2.3 | 4.2 | 4.5 | 3.2 | 2.8 | 3.1 | 2.7 | 2.3 | 7.3 | -- | -- | -- | -- |
| 2891 | Steamboat Springs, USA | 2.8 | 2 | 2.3 | 2.7 | 2.2 | 4.1 | 2 | 4 | 3.3 | 2.3 | 2.8 | 2.9 | 2.4 | 2.1 | -- | -- | -- | -- | -- |
| 2892 | Ocean View, USA | 2.8 | 5.5 | 3.6 | 2.4 | 2.2 | 2.2 | 3.8 | 2.6 | 1.9 | 4.2 | 1.7 | 1.6 | 1.5 | 5.2 | 4.6 | 3.2 | 3 | 11.7 | 11.6 |
| 2893 | Puako, USA | 2.8 | 7.7 | 3.1 | 2.6 | 2.1 | 2.2 | 2.4 | 2 | 2.5 | 3.2 | 1.8 | 1.9 | 1.8 | 2.8 | 4.3 | -- | -- | -- | -- |
| 2894 | Waikoloa Village, USA | 2.8 | 8.4 | 3.1 | 2.2 | 1.3 | 1.5 | 1.7 | 1.6 | 1.7 | 3.1 | 1.9 | 2.2 | 2.1 | 2.2 | 4.2 | 3.5 | 3.4 | -- | -- |
| 2895 | Beatty, USA | 2.8 | 1 | 1.4 | 2.2 | 1.9 | 2.2 | 2.5 | 2.4 | 2.1 | 2.8 | 4.2 | 4.5 | 3.8 | 1.1 | 7.6 | -- | -- | -- | -- |
| 2896 | Socorro, USA | 2.8 | 1.9 | 2.5 | 2.1 | 2 | 2.8 | 4.3 | 2.4 | 4.4 | 2.3 | 3.3 | 2.8 | 2.8 | 3 | 6.2 | -- | -- | -- | -- |
| 2897 | Yellowstone National Park, USA | 2.8 | 1.2 | 1.3 | 1.8 | 2.9 | 4.9 | 2.5 | 4.3 | 5.4 | 3.4 | 2.2 | 2 | 1.3 | 4.4 | 7.2 | 7.3 | 2.8 | 4.3 | -- |
| 2898 | Frisco, USA | 2.7 | 0.8 | 2.2 | 1.8 | 1.5 | 4 | 1.8 | 3.9 | 3.4 | 2.4 | 3.3 | 3.2 | 2.9 | 1.9 | 7.1 | -- | -- | -- | -- |
| 2899 | Kapaau, USA | 2.7 | 9 | 3.6 | 2.2 | 1.2 | 1.2 | 2.1 | 1.7 | 2.2 | 2.9 | 1.3 | 1.6 | 1.4 | 2.8 | -- | -- | -- | -- | -- |
| 2900 | Baker, USA | 2.7 | 0.5 | 1 | 1.6 | 1.5 | 2.7 | 2 | 2.8 | 3.9 | 3.4 | 3.6 | 3.1 | 2.8 | 0.7 | -- | -- | -- | -- | -- |
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