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
1 Sweden
Kungsbacka, Sweden
9.3 11.4 14.7 10.8 4.5 8.1 10.5 10 4.4 8.2 10.8 6.2 10.3 - - - -
2 Sweden
Onsala, Sweden
8.9 7.6 12.6 9.5 5.4 8 11.8 9.2 6.1 8.8 12.6 8.2 6.8 8.6 8.5 - -
3 Sweden
Malmö, Sweden
8.8 8 13.1 11.3 8.3 9.4 11.6 10.8 5.4 4.4 7.9 6.6 8.7 9.8 10.2 12.3 9.9
4 Sweden
Enkoeping, Sweden
8.8 8.4 9.1 9.5 2.8 7.9 11.7 10.2 5.3 7.7 12.5 8.5 8.7 8 8.8 - -
5 Sweden
Saro, Sweden
8.4 8.7 12.4 10.2 3.9 7.1 9.9 9 3.8 7.8 10.7 6.1 9.3 7.9 9.5 - -
6 Sweden
Helsingborg, Sweden
8.4 6 12.3 11.2 5.8 7.1 9 9.7 5.3 7.8 9 6.9 10.7 - - - -
7 Sweden
Boo, Sweden
8.4 - 5.3 8.2 3 7.7 11.5 9.1 5.5 6.9 12.4 7.7 10.3 - - - -
8 Sweden
Moelnlycke, Sweden
7.9 9.4 10.8 11.6 3.3 5.2 7.4 7.1 4.4 7.6 10.7 7.5 12 - - - -
9 Sweden
Lilla Essingen, Sweden
7.8 6.8 8.5 7.8 3.6 6.2 10.4 8.4 4.8 6.8 12 7.6 8.8 7.1 8.1 - -
10 Sweden
Visby, Sweden
7.3 - 26.3 13 5.9 4.5 8.8 7.8 4.7 5.4 9.3 6.2 6 - - - -
11 Sweden
Linköping, Sweden
7.1 7.3 9.4 8.2 4.8 6.2 9.4 8.2 4.3 5.6 7.5 5.8 8.1 - - - -
12 Sweden
Västerås, Sweden
7.1 4.1 6.7 9.3 4.1 7 10.9 9.7 5.2 5.9 7.8 9 6.5 - 6.1 6.6 4.6
13 Sweden
Hedemora, Sweden
6.1 - 10.3 8.4 4.5 5.3 7.6 6.9 3.9 4.5 5.8 7.3 9.3 5.6 - - -
14 Sweden
Solna, Sweden
6 7.3 8.3 6.9 3.5 6.5 7.6 5.9 3.7 3.4 4 3.8 5.8 6.8 6.3 - -
15 Sweden
Stockholm, Sweden
6 5.6 7.3 8.2 4.8 6.4 7.4 5.5 3.9 4.8 6.5 5.4 6.9 5.1 6.1 6.6 4.4
16 Sweden
Goeteborg, Sweden
5.9 4.7 8.1 6.5 3 4.3 7.5 7.2 4.4 6.4 6.9 4.9 6.7 6 - - -
17 Sweden
Klaverod, Sweden
5.6 5.3 4.4 3 - 6.4 7.3 6.2 3.6 5.4 7 5.1 6.5 6.3 7.4 - -
18 Sweden
Haggvik, Sweden
5.2 4.7 5.8 6.6 3 5 5.9 4.4 3.4 4.4 6.5 5.5 5.5 - 5.6 - -
19 Sweden
Sollentuna, Sweden
5.2 4.8 6.1 7.5 3.1 5.1 6.6 4.7 3.4 4.1 6.1 4.8 5.9 5.1 5.6 - -
20 Sweden
Sundsvall, Sweden
5.2 3.5 3.4 6.9 5.4 6.7 7.6 7 3.6 4 5.2 4.9 4.5 5.4 6.4 6.3 5.4
21 Sweden
Norr Malma, Sweden
5 4.8 5.2 6 2.7 5.8 7 5.6 3.9 4.4 6.3 3.9 4.1 4.3 4.9 5 -
22 Sweden
Uppsala, Sweden
5 4.7 5.4 6.2 3.1 4.7 6.3 5.5 3.6 4.5 6 5.2 5.1 4.4 5.5 6.7 4.6
23 Sweden
Björklinge, Sweden
4.9 4 4.5 5.7 2.3 4.6 7.7 6.5 3.5 3.8 5.9 7 5.1 - - - -
24 Sweden
Umeå, Sweden
4.5 3.3 4.2 7.4 4.4 5.1 5.8 5.5 3.6 3.3 4.3 3.7 4.1 4.3 5.1 4.9 3.5
25 Sweden
Bredkalen, Sweden
2.8 2.2 1.9 2.9 1.8 3.1 4.1 5.5 2.7 3.1 2.7 1.4 2.3 - 4.1 3 1.3

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