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 Chile
Angol, Chile
47.7 7.2 7 3.2 - 56.2 125.3 89.9 67.8 52.9 22.1 8.8 12 - - - -
2 Chile
Padre las Casas, Chile
37.2 5.2 5.8 11.4 29.6 70.4 83.2 88.3 58.4 38.3 25.4 12.8 10.7 28.6 32.5 43.3 38.8
3 Chile
Coyhaique, Chile
36.1 6.5 4.5 11.4 27 83.2 127.3 41.3 60.2 33.8 17.3 11.2 5.1 33.3 41.5 34.2 39.3
4 Peru
San Juan de Lurigancho, Peru
34 23.5 22.3 21.8 28.4 40.8 32.7 39.9 37.6 42.3 34.7 36.1 46.9 22.4 - - -
5 Chile
Coronel, Chile
33.3 14.6 13.3 17.4 31.8 70 65.4 76.1 46.9 25 15.2 8.7 13.3 20.7 11.8 19 22.9
6 Chile
Temuco, Chile
32.7 4.5 6.2 10.4 26.2 63.9 81 80.3 50.6 33.5 19.8 8.1 6.5 20.6 20.2 30.4 28.7
7 Peru
Lima, Peru
31.5 12.5 14.6 12.6 19.2 43.9 40.6 46.1 42.9 45.9 37.3 30.8 25.1 18 23.7 28 27.7
8 Chile
Traiguen, Chile
30.1 4 5.7 12.6 22.5 46.3 64.1 64 51.3 40 26.9 8.9 8.7 - - - -
9 Chile
Nacimiento, Chile
26.2 8.8 8.6 12.8 27.7 52.7 106 65.9 39.3 38.8 14.9 6.8 11.3 27.3 - - -
10 Chile
Santiago, Chile
25.8 12.3 16.1 15 28 43.8 41 51.1 41.9 21.8 13.9 11 13.3 23.6 27.7 29.4 23.1
11 Chile
Quilicura, Chile
25.5 12.9 12.7 13.8 23.8 42 42 57.1 37.9 18.4 14 12.5 15 22.3 25.3 - -
12 Chile
Rancagua, Chile
25.4 11.4 11.9 12.1 17.2 38.1 46.2 65 45.6 17.3 11.4 10.4 14.1 23.8 26.9 22.9 23.3
13 Chile
La Pintana, Chile
25.4 17.2 15.4 19.3 30.2 33.5 40 52.2 38.4 17 14.7 9.8 12.6 - - - -
14 Chile
Chillan, Chile
22.7 7.6 8.3 12.5 19.2 47.2 47 42.9 36.2 20.2 9.8 8.4 10 16 20.4 21.5 27.7
15 Chile
Puente Alto, Chile
22.7 13.1 13 14 20.7 35 35.5 46.4 35.4 17.7 13.6 11.5 13.6 20.6 23.5 - -
16 Brazil
Porto Velho, Brazil
22.1 6.5 6.3 5.3 9 13.9 19.1 27.1 82.9 34.3 23.4 6.7 4.5 - - - -
17 Chile
San Fernando, Chile
21.5 11.2 11.1 11.2 19.2 36 45.2 44.7 36.8 16.1 10 7.8 9.1 17.7 21 15.3 18.1
18 Chile
Maule, Chile
20.6 7.8 9.9 12.2 15.9 33.4 41.7 40.5 32.2 18.2 11.4 8.8 12.7 16 20.3 16.1 17.1
19 Chile
Talcahuano, Chile
20.1 9.4 9.6 12 14.7 37.5 42.4 40.6 26.7 15.1 10.4 8 12.2 19 21.4 15.7 21.3
20 Chile
Curico, Chile
19 10.9 6.7 11.1 20.9 32.2 37.6 41.2 29.2 18.8 11 7.5 11.2 19 25.8 16.8 23
21 Chile
Quillota, Chile
18.9 17.4 13.8 13.6 18 24.8 26 38.8 30.9 13.7 10.5 9.7 9 - - - -
22 Chile
Puerto Varas, Chile
18.2 9.3 8.5 13.4 18.8 23.2 23.1 30.3 27.6 23 19 14.7 10.5 - - - -
23 Brazil
Santa Gertrudes, Brazil
18.1 9.7 9.9 11.7 11.2 20.9 21.1 25.3 30.7 34.9 16.6 12.9 10.2 15.9 18.8 - -
24 Chile
Placilla, Chile
18 7.4 8.6 10.5 17.6 31 30.3 39.7 31.5 11.4 6.5 5.4 7.5 - - - -
25 Chile
Las Condes, Chile
18 11.8 12.2 11.9 19.1 26.6 21.9 28.9 27.7 15.2 11.2 11.5 15 15.4 19.9 - -
26 Chile
Osorno, Chile
17.9 6.1 6.3 9.8 20.1 33.7 41.1 34.4 24 24.3 14.8 8.9 7.4 19.2 32.8 38.2 30.8
27 Chile
Linares, Chile
17.9 5.8 9.2 13.3 22.6 38.6 32.4 32.8 30 19.5 10.7 7 7.6 18.7 27.6 25.5 27.1
28 Brazil
Placido de Castro, Brazil
17.8 3.7 3.7 3.3 3.3 8.6 11.1 18.5 54.1 40.9 25.2 5.8 - 15.6 - - -
29 Chile
Concepcion, Chile
17.7 8.8 10 10.5 11.3 22 28 40.9 30.6 18.8 11.7 7.9 11.5 13 14.9 19.6 -
30 Chile
Puerto Aysen, Chile
17.4 3.9 3 8 18.2 27.8 38.7 31 28.5 20.6 12.7 11.2 8.7 17.6 22 - -
31 Chile
Los Angeles, Chile
17.3 6.6 5.2 10.3 16.6 31 36.8 30.3 23.6 15.1 7.8 6.9 14.8 17 21.7 21.6 24.1
32 Chile
Talca, Chile
17.2 8.5 5.8 9.3 16.5 32.5 37.6 35.1 25.7 14.1 6 4.5 9.3 14.6 17.6 13.7 14.3
33 Peru
Tambopata, Peru
17.1 - - 5.2 6.4 11.6 10 16.9 43.3 37.4 17.9 7.4 8 - - - -
34 Peru
Trujillo, Peru
16.9 12.8 15.1 14.2 17.7 20.4 19.9 20.9 18.1 18.1 17.4 14.6 13.9 16.4 18.1 - -
35 Brazil
Osasco, Brazil
16.8 12.7 12.3 14.4 10.3 19.5 16.5 25.6 27.1 23.9 12.6 14 11.3 16.7 19.8 22.1 -
36 Chile
Rengo, Chile
16.8 9.3 7.4 10.1 14.9 26.5 34.6 31 29.9 13.5 9 7.2 8.6 18.8 24.1 18.9 16.3
37 Brazil
Rio Claro, Brazil
16.7 10.3 11.3 13.4 11.1 19.6 16.4 24.3 26.5 29.8 12.1 11.7 9.8 17.8 - - -
38 Chile
La Union, Chile
16.7 4.2 4.7 6.3 15.2 32.8 39 30.9 23.6 26.3 15.7 7 5.6 17.3 24.3 - -
39 Chile
Puerto Montt, Chile
16.6 5.2 6.5 8.5 17.3 27.8 33.8 29.8 25.3 19.2 13.9 8.1 5.3 18.9 26.4 22.6 29.6
40 Chile
La Greda, Chile
16.5 12.3 14 12.1 18.4 26 23.7 25.6 19.4 12.6 12.3 10.8 11 14.5 15.6 - -
41 Brazil
Campinas, Brazil
16.4 11.2 11.2 17 13.1 23.1 18.9 23.6 26.7 - 10.1 12 11 - 20 16 -
42 Chile
Quintero, Chile
16.3 12.3 12.4 12.1 16.1 21.9 21.3 27.6 20.8 13.8 13.9 11.3 10.9 16 14.8 - -
43 Brazil
Guarulhos, Brazil
16.1 11.9 11.4 13.8 11.7 20.4 16.7 25.5 24 22.8 10.2 11.9 11.4 16.4 18.7 21.6 17.3
44 Chile
Curanilahue, Chile
16.1 7.8 6.7 11 16.5 25.2 32.3 25.2 26 17.9 10.5 6.6 9.8 15.4 21.6 - -
45 Chile
Chiguayante, Chile
15.9 9.2 7.9 10.7 15.4 27.7 26.7 27.7 22.9 15.5 10.7 6.3 9.2 14.9 19.8 17 16.1
46 Colombia
Medellin, Colombia
15.6 16.8 18.5 19.8 14.8 12.5 12.8 12.2 14.6 15 15.3 17.1 17.5 19.1 19.9 - -
47 Brazil
Sao Caetano do Sul, Brazil
15.5 13.6 12.7 15.3 9.4 19.6 15.8 20.7 21.8 22.2 10.7 12.7 10.9 15 17.2 18.1 -
48 Brazil
Brasileia, Brazil
15.4 4.4 5 5 4.7 11.9 12 18.6 40.3 42.5 25.5 6.2 4.4 18.6 - - -
49 Chile
Puchuncavi, Chile
15.4 13.6 14 12.8 14.2 19.1 17.8 22.6 18.7 13.1 13.1 12.6 12.8 14 15.9 14.8 13.7
50 Brazil
Sao Bernardo do Campo, Brazil
15.2 13.7 15.3 15.4 9.7 18.3 15.1 18.8 19.5 20.2 11.3 12.4 12 15.9 16.7 16.4 -

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