World's most polluted cities (historical data 2017-2021)

Most polluted city ranking based on annual average PM2.5 concentration (μg/m³)

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2021

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World air quality report

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2021 World air quality report

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Meets WHO guideline
Exceeds by 1 to 2 times
Exceeds by 2 to 3 times
Exceeds by 3 to 5 times
Exceeds by 5 to 7 times
Exceeds by 7 to 10 times
Exceeds by over 10 times
RankAscending icon
City 2021 JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 2020 2019 2018 2017
2101 Slovakia
Topolníky, Slovakia
13.4 13.9 23 16.8 11.5 6.6 13.1 11.2 7.3 10.4 15.7 16.8 14.9 11.6 14.4 - -
2102 South Korea
Tongyeong, South Korea
13.4 15.9 15.6 19.4 14.1 16.1 12.5 8.2 8.2 9.1 13.2 17.7 16.1 - 19.4 - -
2103 Switzerland
Ecublens, Switzerland
13.4 18.1 20.6 18.2 13 5.5 10.3 10.6 9.7 11.7 13.9 16.2 16.9 11 11.3 14.8 -
2104 USA
Anaheim, USA
13.4 12.5 12.1 6.7 10.1 10.9 10.2 13.4 16.3 17.8 8.6 23.7 18.4 12.4 9.1 12 13.6
2105 USA
Arcadia, USA
13.4 10.5 11.8 6.5 9.4 10.9 10.7 15.3 14.9 16.3 10.8 24.8 18.7 17.2 12.2 - -
2106 USA
Carson, USA
13.4 17.1 13.6 9 10.7 9.7 10.6 13.2 13.7 13.8 8.9 22.2 18.4 15.9 - - -
2107 USA
Coarsegold, USA
13.4 17.3 12.7 6.9 5.8 3.3 4.9 8.8 29.2 17.5 24.5 16.7 11.6 24.5 6.6 - -
2108 USA
Hermosa Beach, USA
13.4 14.6 12.2 8 10.3 9.4 10.5 13.4 16.3 17.5 11.2 22.3 15.9 14.3 11.9 - -
2109 USA
Huntington Beach, USA
13.4 17.3 12.4 8 11 9.6 8.3 11.5 16 16.4 10.5 21.9 19 - - - -
2110 USA
Imperial Beach, USA
13.4 12.7 10.6 8.6 10.4 10.7 8.5 11.1 16.1 19.1 15.6 19.9 17.6 - - - -
2111 USA
Miramonte, USA
13.4 2.3 9.4 4.6 6.8 5.2 7.1 7.9 17.4 41.8 38.7 5.4 4.7 17.1 - - -
2112 USA
Monroe, USA
13.4 - 19.2 14.5 13.9 12.5 11 14.8 15.1 14 11.6 12.7 13.3 - - - -
2113 USA
Chicago, USA
13.4 17.4 16.2 12.1 12.4 9 10.3 19.4 16.6 9.3 12.1 12.2 13.6 11.1 12.8 9.4 6.7
2114 USA
Waukegan, USA
13.4 18.2 16.8 11.9 13.4 10.9 10.2 17.9 16.6 8.2 11.5 11.3 13.4 - - - -
2115 USA
Wheaton, USA
13.4 17.8 16.1 13.1 11.7 9.3 9.7 19.1 17.5 9.3 11.8 11.6 13.1 - 11.9 - -
2116 USA
Bigfork, USA
13.4 4.7 5.8 3.5 3.8 3.2 5.5 31.2 31.8 18.9 6.3 13.3 8.8 - 6.7 - -
2117 USA
Hardin, USA
13.4 - 12.2 7.4 4.6 2.9 4.2 28.1 27.4 15.6 10.2 7.7 - - - - -
2118 USA
Lowell, USA
13.4 11.9 10.3 11.3 13.4 13.1 9.8 19 15.4 14.5 22.8 - - 10.8 14.1 - -
2119 USA
Broadview Heights, USA
13.4 - - - 12.5 10.9 14.1 19.1 18 10.9 10.2 11.2 13 - - - -
2120 USA
Jenks, USA
13.4 - - 15.2 13 10.1 12.7 16.9 16.2 11.9 10.6 - - - - - -
2121 USA
Jacksonville, USA
13.4 6.3 7.8 4.3 3.5 2.2 5 10.5 52.7 39.5 3.5 9.9 6.9 17.3 9.5 - -
2122 USA
McKeesport, USA
13.4 14.3 15.7 9.9 12.2 12.3 14.9 20.7 18.2 11.4 8.9 11.7 10.5 11.2 13.3 10 11.2
2123 USA
Coulee Dam, USA
13.4 6.5 3.6 3.1 4.7 3.4 6.1 24.4 47.9 14.6 3.6 8.1 3.6 8.9 6.7 - -
2124 USA
Delafield, USA
13.4 - - 11.8 11.1 9.4 10.2 19.6 19.1 9.3 12.2 12.8 17.5 - - - -
2125 Austria
Leibnitz, Austria
13.3 21 22.5 13.9 10.7 6.1 11.1 8.4 5.4 8.8 13.1 16.5 22.9 14.2 - - -
2126 Belgium
Roeselare, Belgium
13.3 13.5 15.5 17.8 15.4 9.7 13.7 11.5 8.2 16.3 11 14 13.5 12.1 13.3 15.3 14.1
2127 Brazil
Sena Madureira, Brazil
13.3 3.3 3.5 1.7 4.1 7.7 9.1 15.5 35.2 28.9 15.5 2.9 2.7 15.6 - - -
2128 Brazil
Piracicaba, Brazil
13.3 8.6 8.8 11 7.4 15.8 13.7 18.9 21.2 23.1 9.8 8.4 7.8 13.7 13.4 13.6 12.5
2129 China
Qiongshan, China
13.3 - - 15.9 12.9 10.3 12.1 8.9 9.5 10.2 11.2 18.6 22.6 - - - -
2130 Czech Republic
Teplice, Czech Republic
13.3 14 23.9 11.7 8.8 5.8 12 9.4 8.3 11.8 16.8 17.2 20.6 13.4 14.2 19.1 18.8
2131 Germany
Lübeck, Germany
13.3 10.4 14.1 15.3 12.2 9.5 16.2 15.6 11.3 14.3 12.3 13.3 15.5 10.3 9.7 11.4 10.6
2132 Hungary
Szekesfehervar, Hungary
13.3 18.9 25 16.7 12.5 5.8 10.2 10 5.8 10.2 17 20.6 18.2 14.9 - - -
2133 Italy
Acerra, Italy
13.3 21.5 36.8 12.2 8.6 3.1 8.4 8.2 5.2 7.6 6.1 12.1 32 - - - -
2134 Italy
Cava De Tirreni, Italy
13.3 18.3 21 15.4 8.7 6.8 16 8.5 11.2 14.2 12 13.3 14.5 - - - -
2135 Italy
Trento, Italy
13.3 19.8 23.2 15.8 10 5.9 11.7 10.7 10 12.8 11.7 13.3 16.2 13.7 11.9 - -
2136 Japan
Hofu, Japan
13.3 8.5 11.5 14.5 11.5 14.3 18.2 15.3 11.2 14.2 12.7 13.7 11.6 12.1 12.4 12.3 13
2137 Kosovo
Vitina, Kosovo
13.3 21 28.8 15.2 7.4 3.2 7.6 11 9 8.8 22 104.9 25.5 27.2 22.8 - -
2138 Mexico
Santiago, Mexico
13.3 12.6 18.3 15.4 19.3 14.1 12.7 - 9.7 12.1 10.6 10.5 10.9 - - - -
2139 Mongolia
Ulaan-Uul, Mongolia
13.3 16.8 18 16.4 12.4 19.1 9.9 8.7 17.6 8.8 9.2 12.9 10.9 - - - -
2140 North Macedonia
Ilinden, North Macedonia
13.3 - - - 11.5 5.7 9.4 10.8 9.6 8.3 18 25.3 25.2 - - - -
2141 Slovenia
Borovnica, Slovenia
13.3 - 16.6 18 11.7 5 12.7 11 8.5 12 18.9 17.7 15.5 - - - -
2142 Thailand
Tha Maka, Thailand
13.3 - - 39.9 17.6 10.3 6.3 5.1 6.9 6.6 11.3 21.8 38.2 - - - -
2143 USA
Carmichael, USA
13.3 19.3 11.4 7.5 6 3.7 4 8.7 29.5 16 8.7 24.3 18.9 - - - -
2144 USA
Somerset, USA
13.3 10.9 7.1 4.7 4.1 2.4 3.8 6.6 64.7 16.4 8.8 10 9.4 14.7 6 - -
2145 USA
Stockton, USA
13.3 22.5 12.7 7.3 5.6 4.6 4.6 7.3 24.6 14.3 10.4 25.8 19.7 16.1 9.6 17.7 12.5
2146 USA
Torrance, USA
13.3 14 12.2 7.4 10 9.4 9.9 13.2 16.1 16.9 10.5 23 17.8 14.4 11.6 - -
2147 USA
Atlanta, USA
13.3 11.5 12.6 13.9 13.3 11.5 11.4 15.8 15.7 14.4 12.1 12.6 14.9 10 11.9 10.6 11.3
2148 USA
Evans, USA
13.3 10.2 7.2 14.8 16.6 - - 14.2 14.4 15 13.3 12.5 13.1 - 13.5 - -
2149 USA
Flowery Branch, USA
13.3 - 18.2 13 13.5 12.6 11.6 15.2 15.5 13.5 11.4 11.5 13.7 - - - -
2150 USA
Bloomington, USA
13.3 15.3 18.6 12 12.3 12 11.4 19.1 16.1 10.6 10.3 11 11.1 - 8.4 9.8 6.5

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