World's most polluted cities 2019 (PM2.5)

The most polluted cities according to data aggregated from over 60,000 data points.

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2019

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2019 World air quality report

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PM2.5 Legend
WHO target
Good
Moderate
Unhealthy for sensitive groups
Unhealthy
Very unhealthy
Hazardous
Unit: µg/m³
Rank City 2019 AVG JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 2018 AVG 2017 AVG
1 Thailand
Nakhon Ratchasima, Thailand
42.2 42.1 67.9 68 41.4 28.3 17.1 15.7 - - - - 32.6 37.6 -
2 Thailand
Saraphi, Thailand
41.3 45.5 57.4 116.9 84.4 38.1 13 12.5 12.7 20.2 22.7 31.5 44.8 - -
3 Thailand
Pai, Thailand
38.9 24.8 65.3 141.4 120.3 34.8 6.1 5.4 5.4 11.9 12.1 16.3 27 29.4 -
4 Thailand
Hang Dong, Thailand
38 41.8 63.4 99.4 78.7 37 8.7 8.8 9.9 17.1 19.5 28.3 45.4 - -
5 Thailand
Chiang Rai, Thailand
37 28 40.5 113.8 99.3 57.7 10.4 7.6 7.2 14.5 15.7 20.1 29.9 - -
6 Thailand
Mae Rim, Thailand
36.9 25 46.7 100.4 71.6 39.3 14.7 15.2 14.6 19.7 19 26.1 37.2 - -
7 Thailand
Mueang Lamphun, Thailand
36.9 56.6 57.6 76.7 64.8 34.2 11.6 11.1 12.2 21.2 22.5 28.1 49.7 - -
8 Thailand
Khon Kaen, Thailand
36.4 51.6 67.2 68.6 41.5 29.2 17.4 16.9 15.8 29.6 26.3 31.4 42.6 - -
9 Thailand
Mueang Mae Hong Son, Thailand
35.3 29.4 46.8 116.1 99.7 21.3 11.5 5.9 4.7 10.1 9.5 13.1 24.6 - -
10 Thailand
Si Samrong, Thailand
34.6 - - 93.4 58.9 25.5 10.2 11.2 9.6 24.5 27.8 36.4 62.1 - -
11 Thailand
Chaloem Phra Kiat, Thailand
34.4 65.9 50.6 42.5 27.2 24.6 20.6 17.7 16.3 30.2 35.5 42.8 51.3 - -
12 Thailand
Ban Pong, Thailand
33.6 27.5 46.9 100.5 79.3 40.7 7.4 7.2 6.9 14.3 15.6 21.4 34.6 - -
13 Thailand
Lampang, Thailand
33.1 75.6 62.1 78.1 58.2 27.8 11.2 11.2 9 18.7 20.8 25.5 43.6 23.3 19.5
14 Thailand
Tron, Thailand
33 - - 99.8 57.3 33.9 10.3 10 8.1 18.4 20.8 31.1 64.8 - -
15 Thailand
Chaloem Phra Kiat, Thailand
32.8 17.5 37.6 93.2 92.7 39.1 10.3 7.2 4.9 17.1 12.4 13.6 24.9 - -
16 Thailand
Chiang Mai, Thailand
32.3 24.4 47.2 98.7 74.1 33.6 7.8 6.8 7.9 15.8 16.8 23 33.1 24.5 22.7
17 Thailand
Phrae, Thailand
31.3 46.2 62.9 73.1 47.4 31.2 8.3 7.1 7.5 16.3 16.7 23.3 42.9 - -
18 Thailand
Mueang Nan, Thailand
30.9 27.3 47.6 80.6 59 33.4 11.6 11.3 7.3 16.9 13.9 17.8 30.6 - -
19 Thailand
Phutthamonthon, Thailand
30.3 - - 37.8 25.4 26.3 15.4 15.2 11.1 28.4 35.5 51.8 58.6 - -
20 Thailand
Mae Mo, Thailand
30.2 37.2 59 72.5 57.5 35.5 9.8 9 7.8 14.2 12.9 15.9 33.6 - -
21 Thailand
Krathum Baen, Thailand
29.7 64.2 28.2 29.1 22.3 27.5 21.4 18.7 18.2 27.4 31.5 41.5 47.3 - -
22 Thailand
Ratchaburi, Thailand
29.5 78.5 34.1 32.4 19 23.8 20.2 17.2 10.2 15.1 24.2 40.7 53.8 32.2 22.4
23 Thailand
Bang Khonthi, Thailand
28.4 - - 34.3 23.9 22.5 11.8 11.9 9.4 23.2 32.7 54.8 62.5 - -
24 Thailand
Mae Sot, Thailand
27.6 59.4 51.4 53.1 48.6 22.4 9.1 7.9 7.3 14.9 15 22 46.9 32.2 23.2
25 Thailand
Phra Pradaeng, Thailand
27.1 61.6 29.4 32 24.6 26.4 17.2 16.5 13.2 24.9 26.8 33.3 37.2 - -
26 Thailand
Na Wang, Thailand
26.8 - - 96.4 42.1 24.6 11.5 9.4 7.8 21.6 20.2 21.2 33.6 - -
27 Thailand
Samut Songkhram, Thailand
26.3 - 27.2 34.9 23.7 20 9.5 10.5 7.5 21.2 28.5 48 58.7 - -
28 Thailand
Pathum Thani, Thailand
26.2 - 32.3 32.5 22.9 24.6 12.9 11.6 9 24.3 29.2 38.6 50.9 - -
29 Thailand
Tha Bo, Thailand
25.4 44.5 78.5 36.2 21.9 7.9 5.5 5 4.4 - - - - 37.2 -
30 Thailand
Kanchanaburi, Thailand
25.2 74.4 44.7 43.6 29.4 16 6.3 7.4 6.2 15.8 19.1 30.1 49.2 24.9 -
31 Thailand
Thanyaburi, Thailand
24.9 - - 37.7 24.5 24.4 13.7 10.6 8.5 24.5 28.4 37.4 49 - -
32 Thailand
Si Maha Phot, Thailand
24.8 55.6 35.4 32.7 22.6 22.8 15.1 15.6 13.1 17.9 20.4 26.4 36.6 30.9 30.1
33 Thailand
Phra Nakhon Si Ayutthaya, Thailand
24.6 54.9 32 31.6 23 20.3 11.9 11.8 10.3 19.8 22.3 30.3 41.7 - -
34 Thailand
Chiang Saen, Thailand
24.4 - - - 88.2 71.2 11.3 7.4 7.6 18.3 18.3 19.5 28.4 - -
35 Thailand
Pak Kret, Thailand
24.2 35.4 23 27.2 25.1 21.5 11.9 11.2 8.6 21.2 25.5 35.5 47.1 - -
36 Thailand
Tha Yang, Thailand
24.2 - - 37 24.7 18.1 9.8 10.1 7.8 18.2 26.6 42.7 50.3 - -
37 Thailand
Bang Phli, Thailand
24.2 54.2 19.8 27.3 19.4 21.6 9.2 10.3 7.5 21.7 25 34.1 39.8 - -
38 Thailand
Samut Sakhon, Thailand
24.1 102.9 21.1 22.8 18.1 21 9.3 10.4 6.8 23.6 28.2 41.9 44.2 39.8 26.9
39 Thailand
Nakhon Sawan, Thailand
23.9 53.4 43.3 50.6 32.1 20.2 9.7 10 8.4 16.1 19 21 28.4 - -
40 Thailand
Kamphaeng Phet, Thailand
23.6 - - - 49.3 20.8 7.9 7.8 7.1 17.6 18.7 25.5 60.5 - -
41 Thailand
Udon Thani, Thailand
23.4 - - - 44.9 27.1 12 10.2 7 22 23.9 28.4 40.5 - -
42 Thailand
Nonthaburi, Thailand
23.2 70.6 29.4 29.4 19.1 19.2 9.5 10.1 7.6 21.2 25.1 32.9 38.9 - -
43 Thailand
Lam Luk Ka, Thailand
23.2 - 28.6 34.5 25 22.8 14.1 11.7 8.7 21.3 23.5 29.5 39.1 - -
44 Thailand
Bang Lamung, Thailand
23 - - 29.9 20.4 22.3 10.2 10.2 8.1 19.1 26.6 40.5 42.8 - -
45 Thailand
Bang Kruai, Thailand
23 55.6 23 24.3 20 19.5 12.2 13.9 11 22.9 23.4 29 37.2 - -
46 Thailand
Khlong Luang, Thailand
23 85.4 30 30.5 24 22.4 12.9 11.2 9.1 20.4 23.9 33.1 36.8 - -
47 Thailand
Samut Prakan, Thailand
22.9 60 21.8 25.5 19.3 21.6 10.2 11.7 8.9 24.1 27 32.9 37.7 32.2 33.2
48 Thailand
Bangkok, Thailand
22.8 47.4 24.1 27.7 19 19.6 9.4 10.2 7.6 20.4 23.2 30.2 34.2 25.2 27.6
49 Thailand
Saraburi, Thailand
22.7 51.9 35.2 32.9 22 20.8 10.8 11.2 8.9 18.8 19.1 20.3 42.7 - -
50 Thailand
Bang Sao Thong, Thailand
22.6 61.2 23.3 22.3 17.2 19 13.5 15.3 12.9 22.7 26.9 32.5 28 - -

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