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 Mexico
Xonacatlan, Mexico
29.2 33.9 32.7 30.6 31.7 32 24.7 24.4 25.2 26.4 26.6 -- -- 28.5 -- -- -- -- --
2 Mexico
Toluca de Lerdo, Mexico
28.3 36 31.6 30.3 32.2 34.5 28.8 20.9 21.8 23.5 21.6 -- -- -- -- -- -- -- --
3 Canada
Grimshaw, Canada
27.5 -- -- -- -- 53.1 27.4 38.9 34.7 55.6 9.5 11.1 5 -- -- -- -- -- --
4 Mexico
Guadalajara, Mexico
25.8 34.1 35.3 36 34.6 36.8 35.5 20.5 16.3 17.7 13.8 13.1 16.9 26.7 25.4 24.5 18.9 -- --
5 Mexico
San Miguel Totocuitlapilco, Mexico
25.7 30.9 25.2 28.1 32.7 33.9 24.6 17.6 17.4 20.7 16 13.6 -- -- -- -- -- -- --
6 Mexico
Atotonilco de Tula, Mexico
25.1 26.2 26.3 30.5 29 28.1 35.8 18.2 16.7 20.3 16.1 -- -- 26.5 34.3 -- -- -- --
7 Mexico
Ajalpan, Mexico
24.3 29.5 26.9 39 34.9 37.7 37.7 13.9 10.9 12.8 8.7 8.9 9.2 28.1 -- -- -- -- --
8 Mexico
Celaya, Mexico
24.2 27.9 32.1 34.7 35.4 34.7 23.2 15.5 15.4 14.8 14.6 18.8 23.2 19.2 19.3 18.6 20 20.1 22.2
9 Canada
Fort Mckay, Canada
23.8 9.1 5.7 8.7 6.2 43.4 33.9 50.5 44.7 62.6 7.7 6.4 5.2 6.3 5.6 -- -- -- --
10 Mexico
Cuidad Juarez, Mexico
23 29.3 27.8 35.2 31.2 26 30.4 17.4 15.9 15.4 16.2 17.3 19.4 -- -- -- -- -- --
11 Canada
Fort McMurray, Canada
22.8 9.7 5.8 6.6 6.1 48.7 30.8 46.1 44.4 52.7 7.6 5.7 4.1 7.5 7 5.4 6.4 -- --
12 Canada
Peace River, Canada
22.4 18.9 4.8 5.3 3.8 61.3 31.9 33.8 28 45.2 7.9 8.1 5.8 7.1 6.3 -- -- -- --
13 Canada
Fort Vermilion, Canada
22.3 6.3 1.6 2 2.7 30 35 49.5 46.2 49.1 10.2 12.1 6.6 -- -- -- -- -- --
14 Mexico
Mexico City, Mexico
22.3 32.2 25.9 27 28.5 30.5 21.8 15.7 14.6 18.2 13.5 17.4 22.1 22.1 21.7 18.8 20.5 19.7 20.4
15 Mexico
Cuidad de Mexico, Mexico
22.1 29 25.1 26.1 28.3 30.6 22.4 18.2 15.4 16.3 14.9 15.8 22.7 -- -- -- -- -- --
16 Mexico
Morelia, Mexico
21.6 36.3 37.2 25.3 38.5 38.8 23.7 15.9 15.2 18.7 12.9 13.4 14.8 19.9 21.9 -- 16.5 -- --
17 Canada
Timberlea, Canada
21.4 9.4 5 6.2 5.4 44.2 22.5 46.8 40.9 55.7 6 5.8 5.6 -- -- -- -- -- --
18 Mexico
Progreso, Mexico
21.3 32.2 27 18.4 17.3 15.5 18.4 21.5 16.5 19.5 18 29.1 36.2 58 33.8 -- -- -- --
19 Mexico
Salamanca, Mexico
21.3 28.9 24.3 24.5 23.8 29.7 25.2 17.6 13.3 16.6 16.2 17.8 13.8 20 19.6 18 20.9 20.9 25.1
20 Canada
Yellowknife, Canada
20.8 4.4 3.1 3.7 3.6 11.5 19.8 50.7 63 70.6 10.6 3.6 3.8 5.3 4.6 4.4 4.9 -- --
21 Mexico
Garcia, Mexico
20.6 28.2 23.4 26.2 23.9 25.8 28.5 12.2 10.9 9.4 18 19.2 21.8 24.6 19.9 23.9 24.3 -- --
22 Mexico
General Escobedo, Mexico
19.8 27.5 18 21.7 17.4 19.4 19.4 15.2 20.1 16 16.5 20 25.1 21.6 23.1 18.9 20.9 -- --
23 El Salvador
La Union, El Salvador
19.5 10.1 10.8 24 47.6 54.5 14.7 13.6 14.7 11.7 10.3 13.7 14.1 14.2 11.2 -- -- -- --
24 Canada
Conklin, Canada
19.4 8.2 3.2 4.7 5.2 49 27.9 36.3 33 47.5 7.1 5.5 4.3 6.3 6.5 4.6 5.7 -- --
25 Mexico
San Nicolas de los Garza, Mexico
19.3 25.3 19.5 23.9 19.6 23.1 21.1 12.3 14 13.5 15.8 19.2 24.8 20.2 20.1 20.1 20.8 -- --
26 Mexico
Puebla, Mexico
19.3 24.9 18.5 22.8 23.5 24.7 23.4 13 11.8 13.4 10.8 -- -- 13 9.8 13 -- -- --
27 USA
Coraopolis, USA
19.3 7.9 6.5 6.8 5.5 8.8 23.4 18.2 22.2 42.1 54.2 11.8 8.6 7.2 -- -- -- -- --
28 Canada
Fort Chipewyan, Canada
19.2 3.9 2.2 3.6 3.2 20.9 27.9 35.3 58.4 47.1 -- -- 2.9 4.9 4.4 3.8 5.6 4.9 3.6
29 Canada
Fort St John, Canada
18.7 8.5 2.4 5.6 3.8 48.7 34.5 36.5 23 43.2 6 7.5 4 6.3 5.8 4.7 -- -- --
30 Guatemala
Guatemala City, Guatemala
18.7 16.7 15.7 27.4 39.5 39 24 10 13.1 10.9 9.2 6.9 11.7 18.5 19.5 -- -- -- --
31 Canada
Bonnyville, Canada
18.6 17.2 5.6 10 6.6 24.7 26.1 29.5 23.5 24.4 8.3 -- -- 8.5 9.1 4.9 5.5 -- --
32 Mexico
Patzcuaro, Mexico
18.6 21.5 18 16.9 22.8 30.9 23.6 14.2 13.2 20.2 12.3 13.5 16 21.1 21.1 18 20.8 -- --
33 Mexico
Santa Catarina, Mexico
18.6 20.7 20.2 22.8 21.1 22.6 22.9 15.4 13.9 14.3 14.6 15.6 19.3 21.5 21.9 20.7 22.6 -- --
34 Guatemala
Santa Catarina Pinula, Guatemala
18.5 9.8 11.6 23.8 43.9 51.1 24.1 10.7 12.5 10.1 9.1 8.2 9.5 9.5 -- -- -- -- --
35 Mexico
Nezahualcoyotl, Mexico
18.5 23.4 21 20.9 21.3 23.3 7 11.5 10.6 11.1 -- -- 21.1 -- -- -- -- -- --
36 Mexico
San Borja, Mexico
18.1 17.8 15.9 16 17.9 20.6 -- 19.6 18.2 18.9 20.1 17.5 16.7 -- -- -- -- -- --
37 Mexico
Magdalena Contreras, Mexico
17.9 21.9 19 16.5 19.5 22.9 17.3 16.3 13.8 16.2 14.2 16.6 21.1 25.5 -- -- -- -- --
38 Mexico
Guadalupe, Mexico
17.9 18.7 19.3 21.6 21.7 15.7 19.7 14.3 14 11.9 14 19 25.7 17.2 22.1 19.1 17.1 -- --
39 Canada
Beaumont, Canada
17.7 23.9 8.2 14.5 8.7 36.1 20.7 28.2 20 29.3 5.5 8 5.7 12.5 -- -- -- -- --
40 Canada
Salmon Arm, Canada
17.7 12.9 9.8 6.6 4 10.6 13.7 18 95 18.4 6.3 11.2 7.5 9.5 37.4 -- -- -- --
41 USA
Forest Park, USA
17.6 13.6 14.5 18.6 13.7 16 24.1 19.9 20.2 18.7 20.8 -- -- 15.5 16.8 -- -- -- --
42 Canada
Wabasca-Desmarais, Canada
17.5 -- -- -- 4.2 29.3 22.9 31.9 24.6 23.7 3.9 4.3 2.6 5.6 7.6 -- -- -- --
43 Mexico
Leon, Mexico
17.3 22.8 20.3 22.2 21.2 26.1 17.7 13.1 10.1 12.1 11.4 14.9 14 17 16.6 19 20.9 20.8 27.3
44 Mexico
Silao, Mexico
17.3 23.1 21.9 24.5 23.3 25.7 14.7 12 9.6 8.4 10.2 17.6 17.9 16.4 18.6 19 -- -- --
45 Guatemala
Antigua Guatemala, Guatemala
17.1 17.6 15 23.5 31 31.7 22.1 10.4 13 15.1 9.2 6.9 8 20.3 22.4 -- -- -- --
46 Mexico
Monterrey, Mexico
17.1 19.5 17.4 22.5 19.5 20.9 21.2 13.2 12 12.2 13.5 16.2 17.5 18.1 20.1 14.5 19.3 17.2 15.7
47 USA
Cave Junction, USA
17.1 11 14.8 7.2 5.2 4.6 3 12.2 90.5 28.7 6.3 11.5 9.4 9.7 8.9 15.3 7.5 13.3 12
48 Canada
Fort Saskatchewan, Canada
16.8 17.9 6.2 10.7 7.2 35.9 21.9 31.4 19.3 28.3 7.1 9.2 7.8 7.4 8.2 5.8 7.5 11.6 7.9
49 Canada
Redwater, Canada
16.8 14.2 5.1 9.7 6.4 34 23.4 35.2 19.5 33.3 5.8 8 6.3 7.6 8.5 5.5 7.9 -- --
50 Canada
Spruce Grove, Canada
16.8 17.7 6 10 3.7 33.7 20.6 28.8 21.2 29.5 4 5.5 2.8 7.3 9.6 7.2 9.8 -- --

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