2017-2023

World's most polluted cities

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

2023

World Air Quality Report

NEWSROOM
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PM2.5 legend

0-5

Meets WHO guideline

5.1-10

Exceeds by 1 to 2 times

10.1-15

Exceeds by 2 to 3 times

15.1-25

Exceeds by 3 to 5 times

25.1-35

Exceeds by 5 to 7 times

35.1-50

Exceeds by 7 to 10 times

>50.1

Exceeds by over 10 times

Rank
City
2023 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec 2022 2021 2020 2019 2018 2017
1 Chile
Coyhaique, Chile
33.2 4.1 5.3 15 40.1 42 84.1 91.3 47.3 39.8 12.8 10.7 5.7 37.7 36.1 33.3 41.5 34.2 39.3
2 Chile
Nacimiento, Chile
32.4 13.4 51.3 11.6 23.7 52 56.1 71.9 54.1 30.5 16.5 11.1 8.5 22.4 26.2 27.3 -- -- --
3 Peru
Pachacamac, Peru
31.8 35.4 20.9 21.5 23.9 35.1 38.7 35.2 32.9 31.9 35 33.8 31.9 45.8 -- -- -- -- --
4 Chile
Padre las Casas, Chile
29.4 4.3 5.9 10.4 24.1 46 72 52.4 47.8 35.2 19.9 -- 4.6 33.8 37.2 28.6 32.5 43.3 38.8
5 Peru
Carabayllo, Peru
28 33.1 25.9 27.4 25 31.2 31.3 30.4 29.2 28.9 25.2 23.7 27.4 37.6 27.6 18.6 -- -- --
6 Chile
Victoria, Chile
27.4 7.9 34.3 14.8 32.1 47.4 50.7 44.2 41 23.1 13.3 8.3 7 25.5 44.1 -- -- -- --
7 Peru
Puente Piedra, Peru
27.4 25.6 23.2 23 22 39.8 36.2 30.7 30 27.8 28.4 22 29.5 32.9 -- -- -- -- --
8 Chile
Angol, Chile
25.7 8.8 26.6 7.8 24.2 40.9 69.5 23.7 47.9 29.6 13.4 9.2 3.8 20.9 47.7 -- -- -- --
9 Chile
Pudahuel, Chile
25.7 11.9 25.4 11 20.2 43.9 47.1 47.9 26.7 19.7 14.5 7 13.2 -- -- -- -- -- --
10 Chile
Llaillay, Chile
25 13 33.2 19.9 22.5 38.3 45.5 41 26 16 16.4 14.1 15.2 29 20.9 -- -- -- --
11 Chile
Rancagua, Chile
24.2 13.1 32.1 13.1 21.3 40 43.3 47.6 24.8 23.7 13 10.9 9.8 25.4 25.4 23.8 26.9 22.9 23.3
12 Chile
Quilicura, Chile
24 11.7 26.2 13.4 18.5 38.5 37.7 38.6 25.2 20.8 16.7 -- 16.1 24.5 25.5 22.3 25.3 -- --
13 Chile
San Fernando, Chile
23.2 8 35.3 11.5 23.7 39.1 37 36.1 25.8 21.1 14.3 12.5 12.1 20.5 21.5 17.7 21 15.3 18.1
14 Chile
Coronel, Chile
22.9 8.3 26.8 11.9 24 44.5 44.7 39.1 29.7 15.7 12.8 9.7 7.7 24.7 33.3 20.7 11.8 19 22.9
15 Chile
San Felipe, Chile
22.7 10.4 28.9 16.4 21.6 36.3 35 38.3 25.4 18.4 15.7 13 13.4 23.8 -- -- -- -- --
16 Chile
Chillan, Chile
22.5 3.6 58.6 10.4 23.9 33.5 33.7 40 30.3 15.3 9.6 7.1 6.4 19.1 22.7 16 20.4 21.5 27.7
17 Chile
Talagante, Chile
22.3 11.7 24.1 13.5 15.9 39.1 39.4 41.2 23.1 14.1 11.4 -- 9.7 27 29.4 -- 22.7 -- --
18 Chile
Placilla, Chile
22.2 21.3 40.8 9.7 21.2 33.7 32.8 36.4 22.1 11.7 9.4 5.5 -- 18.9 18 -- -- -- --
19 Chile
Santiago, Chile
21.3 11.1 27.5 12.8 20.5 40.2 31 32.5 23.8 19.1 14.5 9.9 13.2 25.8 25.8 23.6 27.7 29.4 23.1
20 Brazil
Xapuri, Brazil
21 -- -- -- -- 10.3 16.1 23.4 31.5 38.8 26.8 12.7 4.6 -- -- -- -- -- --
21 Chile
Puente Alto, Chile
20.8 11.8 26.5 14.1 17.2 31.7 27.4 30.6 21.1 19.6 15.5 -- 13 19.7 22.7 20.6 23.5 -- --
22 Chile
Traiguen, Chile
20.4 5.9 14.7 14.5 24 34.4 37.1 32.1 31.1 18.5 16.2 7 3.7 30.1 30.1 -- -- -- --
23 Chile
Las Condes, Chile
20 11.6 26.7 12.5 20.2 32.9 23.1 24.3 23.1 19.1 17.6 12.8 16.9 21.6 18 15.4 19.9 -- --
24 Chile
Quilpue, Chile
19.9 17.2 32 18.7 19.2 28.7 32.5 28 16.3 12.3 11.5 10.9 12.6 39.1 -- -- -- -- --
25 Chile
Villa Alemana, Chile
19.7 10 31.9 19.2 20.6 30.3 34.4 29.8 16.6 12.1 12.4 10.8 12.1 33 14.2 -- -- -- --
26 Peru
Lima, Peru
19.7 16.5 14.8 15.1 13.1 21.6 21.9 23.1 25.1 24 24.1 18.8 17.6 25.6 31.5 18 23.7 28 27.7
27 Brazil
Osasco, Brazil
19.4 13.6 12.5 16.8 15.1 -- 40.5 26.1 26.1 22.8 16.6 19.6 15.3 15.1 16.8 16.7 19.8 22.1 --
28 Chile
Curico, Chile
18.7 9.3 34.7 10.4 18.9 32.9 32.4 30.4 21.1 15 11.9 7.1 7.1 17.1 19 19 25.8 16.8 23
29 Chile
Putaendo, Chile
18.4 14.4 27.6 17.3 20 25.3 22.5 22.1 17.2 14.2 13.9 10.9 12.9 -- -- -- -- -- --
30 Chile
La Ligua, Chile
18.3 14.7 33.1 20.3 18.5 25.5 22.6 17.4 14.5 12.9 13.5 12.5 15.1 14.9 -- -- -- -- --
31 Colombia
Itagui, Colombia
18.2 -- 34.9 24.5 17.2 19.6 15.2 17.6 15.8 18 20.6 16.2 18.7 -- -- -- -- -- --
32 Chile
Hualqui, Chile
18.1 7.7 32.9 10.2 16.2 32.3 29.4 30.7 23.7 13.1 11.2 6.9 7.9 -- -- -- -- -- --
33 Chile
Los Angeles, Chile
18.1 6.1 46.1 9 13.4 23.1 26.1 34.5 26.5 12.2 10.5 6.4 5.1 16 17.3 17 21.7 21.6 24.1
34 Chile
Laja, Chile
18 10.1 35.1 9.5 16.8 34.7 28.1 36.9 -- -- 11.1 6.9 6.2 17.4 -- -- -- -- --
35 Colombia
La Estrella, Colombia
17.8 -- 33.4 21.5 19.2 17.5 15 15.4 17.7 19.7 20.6 16.9 15 -- -- -- -- -- --
36 Guyana
Linden, Guyana
17.6 11.3 10.8 21.8 37.8 8.8 8.8 12.4 14.6 25.6 30.6 22.8 22.1 12.2 -- -- -- -- --
37 Colombia
Envigado, Colombia
17.4 20.6 26.9 23.4 17.3 15.3 12.5 12.2 15.5 17.9 17.6 12.9 16.6 23.5 -- -- -- -- --
38 Chile
Talcahuano, Chile
17.2 8.4 20.5 8.9 14.8 25.5 34 39.3 23.8 14.4 8.7 5.7 6.7 19.6 20.1 19 21.4 15.7 21.3
39 Chile
San Antonio, Chile
17.2 13.5 24.4 14.4 16 22.3 -- 19.2 16.9 14.6 15.7 15.5 18 17.2 -- -- -- -- --
40 Colombia
Sabaneta, Colombia
17 -- 36.8 21.7 17 18 14.9 14.9 16.7 18.2 17 15.1 18.7 -- -- -- -- -- --
41 Guyana
Georgetown, Guyana
17 16 15.2 26.2 21.9 14.8 8.5 11.8 13.7 17.5 18.7 19.4 20.9 12.7 6.5 -- -- -- --
42 Brazil
Manaus, Brazil
16.8 5 3.9 6.1 4.7 5 7.9 12.8 19 33 53.6 39.8 6.9 12.7 10.3 -- -- -- --
43 Chile
Temuco, Chile
16.8 4.6 6.5 10 16.3 23.9 42.1 30.4 25.8 16.2 14.1 7.4 4.4 26.3 32.7 20.6 20.2 30.4 28.7
44 Chile
Hualpen, Chile
16.8 9.3 19.1 9.7 11.8 25.6 34.3 29.4 18.1 12.7 13.7 9.7 8.8 27.4 -- -- -- -- --
45 Chile
Puerto Varas, Chile
16.8 5.8 6.5 12.2 21.3 25.1 31 25.5 21.2 17.2 18.8 14.9 9.4 20.3 18.2 -- -- -- --
46 Colombia
Caldas, Colombia
16.8 17.2 24.9 20.3 14.6 14.2 12.9 13.5 15.9 17.1 16.4 15.5 20 -- -- -- -- -- --
47 Chile
Rengo, Chile
16.6 9.4 28 11.4 16.9 28.5 -- 35.4 20.7 16 8.5 4.9 9.2 18.8 16.8 18.8 24.1 18.9 16.3
48 Colombia
Salgar, Colombia
16.6 -- -- 24.9 18 17.8 13.8 13.7 15.8 17.5 17.3 12.6 14.5 -- -- -- -- -- --
49 Chile
Maule, Chile
16.4 7 37.9 9.2 17.8 27.4 23.6 29.1 18.4 9.6 8.1 5.5 5.8 -- -- -- -- -- --
50 Brazil
Camacari, Brazil
16.2 21.3 20.7 16.4 16.8 9.8 7.9 15.7 19 19 19.1 13.3 14.7 18.8 -- -- -- -- --

1-50 of 143

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