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 |
|---|---|---|---|---|---|---|---|---|---|---|
| 1909 |  East York Canada | 6.9 | 4 | -- | -- | -- | -- | -- | -- | -- |
| 1910 | Egbert Canada | 6.9 | 4.9 | -- | -- | -- | -- | -- | -- | -- |
| 1911 | Charette Canada | 6.9 | 5.4 | 8.3 | 6.3 | 6.9 | -- | -- | -- | -- |
| 1912 | Parc Cambron Canada | 6.9 | 5.8 | 7.7 | 5 | 8.1 | -- | -- | -- | -- |
| 1913 |  Phoenix USA | 6.9 | 7.4 | 5.7 | 5.5 | 7.3 | 8.4 | 5.8 | 8.6 | 8.4 |
| 1914 | Anderson USA | 6.9 | 6.9 | 7.7 | 7.5 | 16.2 | 15.9 | 10.6 | 27.8 | 23.5 |
| 1915 | Banning USA | 6.9 | 8 | 8.7 | 7.4 | 9.7 | 9.9 | 9.6 | 11 | 12 |
| 1916 | Bay Point USA | 6.9 | 6 | 7.8 | 9.8 | 11.4 | -- | -- | -- | -- |
| 1917 | Cathedral City USA | 6.9 | 8.5 | 5.8 | 3.9 | 6.3 | 7.8 | 5.8 | -- | -- |
| 1919 | Elverta USA | 6.9 | 7.6 | 10.3 | 21.9 | -- | -- | -- | -- | -- |
| 1920 | Hermosa Beach USA | 6.9 | 6.3 | 8.4 | 11.5 | 13.4 | 14.3 | 11.9 | -- | -- |
| 1921 | Kings USA | 6.9 | -- | -- | -- | -- | -- | -- | -- | -- |
| 1922 | Ladera Heights USA | 6.9 | 7.7 | -- | -- | -- | -- | -- | -- | -- |
| 1923 | Laguna Beach USA | 6.9 | 6.3 | 8.3 | 8.3 | 13 | -- | -- | -- | -- |
| 1925 | Madera USA | 6.9 | 9 | 9.8 | 11.9 | 14.7 | 17.3 | 9.7 | -- | -- |
| 1926 | Mammoth Lakes USA | 6.9 | 5 | 4.7 | 4.2 | 11.7 | 25.6 | -- | -- | -- |
| 1927 | Mountain House USA | 6.9 | 6.7 | 8.5 | 8.4 | 10.9 | 15.3 | 7.8 | -- | -- |
| 1928 | Oak Park USA | 6.9 | 7.1 | 8.2 | 7.6 | 10.5 | -- | -- | -- | -- |
| 1929 | San Diego USA | 6.9 | 6.7 | 8.2 | 8.8 | 11.1 | 11.7 | 9.4 | 12.4 | 12.8 |
| 1930 | Santa Clarita USA | 6.9 | 7.1 | 8.2 | 6.9 | 9.3 | 10.3 | 8 | -- | -- |
| 1931 | Stanislaus USA | 6.9 | -- | -- | -- | -- | -- | -- | -- | -- |
| 1932 | Temescal Valley USA | 6.9 | 7.7 | -- | -- | -- | -- | -- | -- | -- |
| 1933 | Berthoud USA | 6.9 | 10 | 5.9 | -- | -- | -- | -- | -- | -- |
| 1934 | Bethune USA | 6.9 | -- | -- | -- | -- | -- | -- | -- | -- |
| 1935 | Woodmoor USA | 6.9 | 6.4 | 4.9 | -- | -- | -- | -- | -- | -- |
| 1936 | Dover USA | 6.9 | 6.7 | 10.6 | 10.7 | 12.2 | -- | -- | -- | -- |
| 1937 | Belle Glade USA | 6.9 | 7.3 | 7.3 | 6.5 | 7.1 | 6.5 | 7 | 8.2 | 10.2 |
| 1938 | High Springs USA | 6.9 | -- | -- | -- | -- | -- | -- | -- | -- |
| 1939 | Ocala USA | 6.9 | 7.5 | 8 | 7.7 | 8.7 | -- | 8.5 | 7.8 | 8.3 |
| 1940 | Cobden USA | 6.9 | 6 | 10.4 | -- | -- | -- | -- | -- | -- |
| 1941 | Jerseyville USA | 6.9 | 6.2 | 9.2 | 8 | 8.4 | 7.5 | 8.5 | -- | -- |
| 1942 | Somerset USA | 6.9 | 6.6 | 8.9 | 7.8 | 9 | -- | -- | -- | -- |
| 1943 | South Portland City USA | 6.9 | -- | -- | -- | -- | -- | -- | -- | -- |
| 1944 | Beltsville USA | 6.9 | 5.1 | 8.1 | 5.6 | 6.6 | 5.9 | 7.3 | 6.8 | 7.6 |
| 1945 | Glen Burnie USA | 6.9 | 7.7 | 12.2 | 10.5 | 11.9 | 10.8 | 12.4 | -- | -- |
| 1946 | Riverdale Park USA | 6.9 | 3 | 9.9 | 8.4 | 12.4 | -- | -- | -- | -- |
| 1947 | Upton USA | 6.9 | 6.3 | 6.8 | -- | -- | -- | -- | -- | -- |
| 1948 | Worcester USA | 6.9 | 6.3 | 8.1 | 6 | 9.1 | 8.3 | 8.4 | 7.3 | 6.4 |
| 1949 | Harrisville USA | 6.9 | 5.2 | -- | -- | -- | -- | -- | -- | -- |
| 1950 | St. Peter USA | 6.9 | -- | -- | -- | -- | -- | -- | -- | -- |
| 1951 | Helena USA | 6.9 | 8.4 | 8.1 | 7.5 | 10.4 | 6.5 | 7.7 | 6.7 | 9.9 |
| 1952 | Lolo USA | 6.9 | 3.1 | 3.2 | 5.5 | 21.1 | -- | -- | -- | -- |
| 1953 | Potomac USA | 6.9 | 8.5 | 9.8 | 11.3 | -- | -- | -- | -- | -- |
| 1954 | Ronan USA | 6.9 | 7.9 | 9.1 | 12.6 | -- | -- | -- | -- | -- |
| 1955 | Moultonborough USA | 6.9 | -- | -- | -- | -- | -- | -- | -- | -- |
| 1956 | Clinton USA | 6.9 | 6.6 | -- | -- | -- | -- | -- | -- | -- |
| 1957 | North Haledon USA | 6.9 | 6.4 | 8.2 | -- | -- | -- | -- | -- | -- |
| 1958 | Red Bank USA | 6.9 | 7 | 10.2 | -- | -- | -- | -- | -- | -- |
| 1959 | Binghamton USA | 6.9 | 6.2 | 9.4 | 7.5 | 10.2 | 9.2 | 9.2 | -- | -- |
| 1960 | Brighton USA | 6.9 | 6.3 | 9.6 | 6.6 | -- | -- | -- | -- | -- |
