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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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 Czech Republic
Kamenice, Czech Republic
28.2 - - 6.3 30.5 14 21.8 15.4 14.4 26 40 48.2 46.2 - - - -
2 Czech Republic
Rajec-Jestrebi, Czech Republic
26.7 33.1 72.8 44.8 21.9 9 13.2 11.1 8 14.9 31.2 43.3 43.4 - - - -
3 Czech Republic
Novy Knin, Czech Republic
23 31.8 41.2 27.5 23.8 11.8 18.7 12.6 10.7 18.7 27.6 31.3 27.3 - - - -
4 Czech Republic
Dolni Lutyne, Czech Republic
22.8 36.8 50.3 30.6 18.1 9.6 13.9 13.4 8.3 12.4 23.1 22.9 36.6 20.9 27.7 35.8 32.3
5 Czech Republic
Frydlant, Czech Republic
22.2 31.4 31.6 25.5 22.5 13.1 19.1 13.6 10.9 18.5 23 31.7 27 19.3 19.1 - -
6 Czech Republic
Klatovy, Czech Republic
20.9 27 34.2 24.7 21 9.3 13.8 7.8 6.6 11.8 26.3 26.8 19.2 - 10.8 - -
7 Czech Republic
Havirov, Czech Republic
19.6 27.8 41.5 21.7 14.4 8.7 15 13.9 9.2 13.4 18.9 20.9 31.1 18 20.3 28.8 26.7
8 Czech Republic
Ostrava, Czech Republic
19.6 29.6 37.9 21.8 15.3 9 15.7 13.6 8.6 14.5 18.6 21.3 30.5 16.8 20.9 30.1 27.8
9 Czech Republic
Tesin, Czech Republic
19.5 24.7 43.4 22.2 15.3 8.7 14.5 13.4 9.2 14 17.4 19.6 33.3 17.9 20 29.6 27.2
10 Czech Republic
Litomerice, Czech Republic
19 13.6 16.5 20.6 16.8 10.4 16.9 12.9 11.6 18.6 27.9 31.5 28.6 12.4 - - -
11 Czech Republic
Trinec, Czech Republic
18.2 22 36.7 20.5 14.8 8 13.8 14.4 9.1 14.4 15.2 18.6 31.6 15.1 18.2 26.5 26.7
12 Czech Republic
Frydek-Mistek, Czech Republic
17.8 19.2 36.8 16.9 13.4 8 13.7 14.7 8.7 13.3 17.8 20.6 32 16.2 17.6 26.9 25
13 Czech Republic
Olomouc, Czech Republic
17.7 21.9 34.9 21.2 12.6 7.9 13.1 12.9 9.2 12.8 19.9 19.8 27.5 15.8 16.1 19 20.4
14 Czech Republic
Valasske Mezirici, Czech Republic
17.4 20.3 37 20 12.8 6.9 12.9 13.2 8 12.4 18.3 19.3 29 15 17.2 24.8 24.9
15 Czech Republic
Studenka, Czech Republic
17.2 24.5 37.8 17.7 11.7 7.2 12.2 11.6 7.3 11.9 16.6 20.9 28.7 16.2 18 25.4 24.3
16 Czech Republic
Decin, Czech Republic
17.1 18.2 34.8 17.1 12.4 7.9 13.4 11.3 9.8 14.2 22.9 20.4 24.3 16.4 17.8 23.1 23
17 Czech Republic
Moravska Trebova, Czech Republic
17 22.3 35 19.1 12.2 7.1 10.9 11 7.9 12.1 19.2 21.6 26.7 16.2 18.9 23 18.9
18 Czech Republic
Prerov, Czech Republic
16.2 16.7 37.1 17.2 11 6.5 11.5 10.8 7.7 11.6 17.7 20.3 28.4 15.5 17.9 22.9 24.4
19 Czech Republic
Opava, Czech Republic
15.8 22 34.8 16.2 10.9 6.4 12.1 11.3 7.4 11.3 14.4 17.7 26.4 14.9 16.9 24.5 22.7
20 Czech Republic
Brno, Czech Republic
15.4 17.9 30.1 20.8 13.3 6.7 11.2 9.3 6.8 11.1 17.4 20.2 20.7 13.5 15.7 20.4 18.8
21 Czech Republic
Beroun, Czech Republic
15.3 19.1 29.5 20.4 13 6.9 12.5 9.5 7.5 12.4 17.3 19.2 17.4 14 15.6 22.5 18.8
22 Czech Republic
Zlin, Czech Republic
14.7 13.9 30.5 16.7 11.3 6.3 12.1 11.9 7.7 10.7 15.4 17.8 23.7 13 16.5 21.7 21.3
23 Czech Republic
Hradec Kralove, Czech Republic
14.5 18.1 28.7 14.9 10.9 6.1 11.6 10.6 8.3 12.9 17 20.2 16.4 13.7 14.8 19.7 19
24 Czech Republic
Marianske Radcice, Czech Republic
14.5 16.8 29.3 12.8 10.7 6.6 12.9 10.6 8.3 12.5 17.5 18.8 18.1 14.9 15.5 20.5 18.7
25 Czech Republic
Most, Czech Republic
14.1 14.5 29.3 12.6 10.9 6 14.9 10.3 8.3 12.8 17.6 17.7 15.8 13.8 15.1 21.7 18.3
26 Czech Republic
Pardubice, Czech Republic
13.8 14.2 26.4 14.7 10.2 5.9 12.4 9.5 8.3 12.3 16.5 17.4 18.5 12.5 14.7 19.4 18.3
27 Czech Republic
Mlada Boleslav, Czech Republic
13.4 12.5 25.2 13.6 10 5.8 10.8 9.8 7.5 11.6 16.6 18.3 20.5 13 15.6 19.1 15.9
28 Czech Republic
Rozdalovice, Czech Republic
13.4 15.1 26.5 13.5 10.1 5.7 9.6 9.1 6.7 10.2 15.4 19.8 20.3 13.6 13 19.2 18.6
29 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
30 Czech Republic
Kromeriz, Czech Republic
13.2 11.7 28.8 13 9.2 5.9 11.3 11.2 7.1 11.2 15 14.8 20.6 12 14.3 20.8 18.5
31 Czech Republic
Usti nad Labem, Czech Republic
12.9 12.9 22.8 12.5 9.8 6.3 11.5 8.1 7.1 11.2 16.9 17.5 18.6 12 14.1 18.3 17
32 Czech Republic
Plzen, Czech Republic
12.7 14.6 26.6 17 12.3 6.3 11.2 7.6 5.8 9.2 15.1 14.2 13.7 11.5 12.6 - -
33 Czech Republic
Jihlava, Czech Republic
12.2 11.6 21.9 17.1 11.7 6.3 10.8 9.9 7.7 11.1 14.2 12.9 - 12 13.3 16.9 14.2
34 Czech Republic
Kladno, Czech Republic
12 11.9 26 13.7 10.4 5.6 9.8 8 6.3 11.3 15.2 13.7 13.4 12.3 12.2 19 18
35 Czech Republic
Kadan, Czech Republic
11.9 12.8 24.2 10.3 9.7 5.7 12.3 9.8 6.6 10.6 13.8 13.6 14.2 11.2 12.8 18.8 14.8
36 Czech Republic
Znojmo, Czech Republic
11.8 12.5 25.5 13.3 9.9 5.1 9.8 8 6.1 9.4 14.2 13.7 15.2 11.9 14.2 19.7 17.4
37 Czech Republic
Liberec, Czech Republic
11.4 9.9 19.7 11.3 9.6 5.6 10.4 9.3 8.1 11.3 13.1 16 13.2 11.6 12.5 18.4 15.8
38 Czech Republic
Prague, Czech Republic
11.3 11.6 21.6 13.5 9.9 5.3 10.4 7.4 5.9 10.4 13.8 14.9 12.5 10.9 11.5 17.4 15.6
39 Czech Republic
Budejovice, Czech Republic
10.7 12 17 12.3 8.8 4.6 9.4 8.2 6.7 10.2 13.7 13.5 12.9 11 12.7 16.9 17.1
40 Czech Republic
Kamenny Ujezd, Czech Republic
10.6 12.8 22.6 11.7 10.4 5 10.9 8.3 8 12 14.7 6.5 5.4 11.5 12 16.4 16.9
41 Czech Republic
Sedlec, Czech Republic
10.5 9 22.7 10.1 8.1 4.7 8.9 8.6 6 9.2 12.4 13.6 13.5 10.3 12.6 18.6 16.2
42 Czech Republic
Chystovice, Czech Republic
8.8 6.2 14.4 9.7 7.9 4.2 8.6 7.7 5.9 9 10.5 14.1 9 9.1 10.1 14.5 11.8
43 Czech Republic
Sokolov, Czech Republic
8.6 6.9 15.6 7.3 7.4 4.4 9.9 7.9 5.8 9.2 10.4 9.9 8.9 8.9 9.4 15.1 13.1

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