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 (concentration in μg/m3 categorized by WHO guideline)
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 |
|---|---|---|---|---|---|---|---|---|---|---|
| 2064 |  Double Horn USA | 6.8 | -- | -- | -- | -- | -- | -- | -- | -- |
| 2065 | Justin USA | 6.8 | 7 | 8.5 | 7.4 | 11.4 | -- | -- | -- | -- |
| 2066 | Portland USA | 6.8 | -- | -- | -- | -- | -- | -- | -- | -- |
| 2067 | South Weber USA | 6.8 | 8 | 7.3 | 6.6 | 10.5 | 9 | 6.4 | -- | -- |
| 2068 | Johnson USA | 6.8 | 5.8 | 7.9 | -- | -- | -- | -- | -- | -- |
| 2069 | Fairfax USA | 6.8 | 6.3 | 11.2 | 10 | 11.7 | -- | -- | -- | -- |
| 2070 | Haymarket USA | 6.8 | 6.9 | 11.8 | -- | -- | -- | -- | -- | -- |
| 2071 | Smithfield USA | 6.8 | 7.9 | -- | -- | -- | -- | -- | -- | -- |
| 2072 | Colville USA | 6.8 | 5.3 | 8.9 | 8.2 | 14 | 13.4 | 8.3 | 13.3 | 19.1 |
| 2073 | Walla Walla USA | 6.8 | 6.4 | 8.2 | 10.6 | 8.6 | 13.3 | 7.8 | 7.2 | 12.7 |
| 2074 | Beckley USA | 6.8 | 6.9 | -- | -- | -- | -- | -- | -- | -- |
| 2075 | La Crosse USA | 6.8 | 5.7 | 8.9 | 7.4 | 8 | 7.7 | 7.9 | 7.7 | 6.8 |
| 2076 | Maple Bluff USA | 6.8 | 6.2 | 13.3 | 19.1 | -- | -- | -- | -- | -- |
| 2077 | Sparta USA | 6.8 | 6.4 | 12.6 | 10.1 | 12.5 | -- | -- | -- | -- |
| 2078 |  Lac des Arcs Canada | 6.7 | 5.8 | 9.6 | -- | -- | -- | -- | -- | -- |
| 2079 | Spruce Grove Canada | 6.7 | 8.1 | 16.8 | 7.3 | 9.6 | 7.2 | 9.8 | -- | -- |
| 2080 | Burns Lake Canada | 6.7 | 8.3 | 13.9 | 7.6 | 7.4 | 7.5 | 10.9 | -- | -- |
| 2081 | Eagle Bay Canada | 6.7 | 6.4 | 14.5 | -- | -- | -- | -- | -- | -- |
| 2082 | Harrison Hot Springs Canada | 6.7 | 1.2 | 1.6 | -- | -- | -- | -- | -- | -- |
| 2083 | Osoyoos Canada | 6.7 | 6.9 | -- | -- | -- | -- | -- | -- | -- |
| 2084 | Salmon Arm Canada | 6.7 | 6.2 | 17.7 | 9.5 | 37.4 | -- | -- | -- | -- |
| 2085 | Parry Sound Canada | 6.7 | 4.9 | 8.2 | 4.9 | 5.4 | 4.9 | 4.4 | 5.2 | 4.8 |
| 2086 | Tiverton Canada | 6.7 | 5.4 | 8.4 | 5.1 | 5.9 | 5.2 | 5.4 | 5.8 | 5.4 |
| 2087 | Granby Canada | 6.7 | 6.3 | 8.8 | -- | -- | -- | -- | -- | -- |
| 2088 | Hoover USA | 6.7 | 11 | 10.6 | 11.7 | 13.1 | -- | -- | -- | -- |
| 2089 | Benton USA | 6.7 | 4.8 | 3.6 | 2.6 | 12.5 | -- | 4.4 | -- | -- |
| 2090 | Campo USA | 6.7 | 6.4 | 6.7 | 5.5 | -- | -- | -- | -- | -- |
| 2091 | Caspar USA | 6.7 | 5.8 | 7.2 | 5.9 | -- | -- | -- | -- | -- |
| 2092 | Coarsegold USA | 6.7 | 6.3 | 7.3 | 8 | 13.4 | 24.5 | 6.6 | -- | -- |
| 2093 | Crestline USA | 6.7 | 7.3 | 6.8 | 7.3 | 9 | 9.4 | 8.2 | 9.3 | 11.4 |
| 2094 | Fillmore USA | 6.7 | 7.5 | 7.5 | 8.3 | 10.4 | 9.9 | 7.6 | 9.9 | 8.4 |
| 2095 | Ione USA | 6.7 | 6.2 | 7.6 | 8.2 | 15.2 | -- | -- | -- | -- |
| 2096 | Millville USA | 6.7 | 6.4 | 6.8 | 6.7 | 16.4 | 16.6 | 6.4 | -- | -- |
| 2097 | Roseville USA | 6.7 | 6.2 | 8.2 | 9.8 | 12.5 | 15.2 | 7.6 | 11.4 | 7.4 |
| 2098 | Danbury USA | 6.7 | 6.4 | 9.5 | 8 | 8 | 8 | 7.8 | 8 | 7.8 |
| 2099 | New Canaan USA | 6.7 | 6.7 | -- | -- | -- | -- | -- | -- | -- |
| 2100 | Holden Heights USA | 6.7 | 6 | -- | -- | -- | -- | -- | -- | -- |
| 2101 | Cleveland USA | 6.7 | -- | -- | -- | -- | -- | -- | -- | -- |
| 2102 | Savannah USA | 6.7 | 6.9 | 9.8 | 9.5 | 9.8 | 8.6 | 8.9 | -- | -- |
| 2103 | Mount Vernon USA | 6.7 | 6.9 | 9.4 | 8.9 | 10.7 | 9.8 | 12.1 | -- | -- |
| 2104 | Emmetsburg USA | 6.7 | 6.4 | 11.7 | 8.5 | 10.4 | 6.4 | 7.7 | 8.6 | 8.7 |
| 2105 | Highland Heights USA | 6.7 | 5.8 | 9.3 | 7.7 | 8.7 | 7.8 | 8.1 | -- | -- |
| 2106 | Nicholasville USA | 6.7 | -- | -- | -- | -- | -- | -- | -- | -- |
| 2107 | Smiths Grove USA | 6.7 | 6.3 | 9.3 | 7.4 | 9 | 7.6 | 8 | 9.1 | 9 |
| 2108 | Chaptico USA | 6.7 | 6.8 | 10.6 | 9.4 | -- | -- | -- | -- | -- |
| 2109 | Glassmanor USA | 6.7 | 5.9 | -- | -- | -- | -- | -- | -- | -- |
| 2110 | Greenbelt USA | 6.7 | 7.2 | 12 | 11.2 | 10.5 | -- | -- | -- | -- |
| 2111 | Westfield USA | 6.7 | 4.8 | 7.2 | 6.2 | 1.7 | -- | -- | -- | -- |
| 2112 | Wilmington USA | 6.7 | 6.2 | -- | -- | -- | -- | -- | -- | -- |
| 2113 | Burnsville USA | 6.7 | 6.1 | 11.8 | 8.1 | 13.5 | -- | -- | -- | -- |
