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 Romania
Ojdula, Romania
30.3 48.6 49.5 41.4 30.2 13.9 16.9 16.4 15.3 19.1 33.4 40.4 40.6 - - - -
2 Romania
Otopeni, Romania
25.8 43.7 39.3 33.4 25.7 12.8 13.4 17.1 16.7 14.7 27.9 35.5 28.8 - - - -
3 Romania
Targu-Mures, Romania
22.3 33.7 32.1 28.5 17.7 9.8 13.7 12.3 12.4 14.9 28.1 35 30.2 15.1 - - -
4 Romania
Modelu, Romania
21 21.9 27.6 22.6 21.6 8.2 22.7 76.2 12.1 13.1 20.1 22.6 20.6 20.1 - - -
5 Romania
Craiova, Romania
21 25.1 29.7 21.1 20.3 11.7 16.1 14.4 15.5 21.8 23.8 28.3 23.8 - - - -
6 Romania
Iasi, Romania
20.6 26.7 30.6 25.5 19.3 13.3 17.5 15.3 12.1 17.2 25 24.5 21.1 - 22.4 27 -
7 Romania
Radauti, Romania
20.3 33.5 40.9 21.8 18.3 7.2 10.1 12.6 9.8 12.1 21 29 27.5 - - - -
8 Romania
Cluj-Napoca, Romania
20.1 16.3 18.9 13.2 10 9 14.6 19.8 16.3 19.6 31.4 40.5 31.8 13.1 15.7 21.4 -
9 Romania
Drobeta-Turnu Severin, Romania
20 22.9 22.1 16.9 13.6 9 11.4 14 15.1 17 31.3 43.9 23.9 12.7 - - -
10 Romania
Brasov, Romania
17.3 30.7 30 19.1 11.9 7 9.5 12.5 10.9 11.2 18 25.6 22.4 18.3 18 21.3 -
11 Romania
Valeni, Romania
17.3 22.3 22.4 18.1 13.4 9.4 9.9 14.2 12.2 19.4 28.3 21 18.2 - - - -
12 Romania
Ploiesti, Romania
17.2 24.2 25.7 17.8 15 11.6 11.8 15.8 14.5 12.1 19 24.4 19.2 - - - -
13 Romania
Turnu Magurele, Romania
17 14.5 27.5 18.6 12.6 12.3 11.2 21.3 14.2 19.3 17.9 21.9 8.6 - - - -
14 Romania
Ramnicu Valcea, Romania
17 24.6 - 17.8 17.5 8.4 8.2 9.5 9.7 10.2 14.5 29.7 24.5 - - - -
15 Romania
Arad, Romania
16.3 19.6 28 19.1 13.5 7.9 - 11.6 10.9 11 19.7 20.2 13.8 - - - -
16 Romania
Magurele, Romania
15.5 17.7 19.7 15.7 12.6 9.8 11.4 12.8 12.9 11.8 18 23.2 21 - 15.7 18.9 -
17 Romania
Caciulati, Romania
15.4 23.3 24.7 19.9 14.7 9.1 8.3 11.6 11 9.4 15.3 20.8 16.8 - - - -
18 Romania
Baia Mare, Romania
15.3 25 30.5 23.1 14.6 7.9 10 10.5 8.6 9.5 14.1 20.6 21.5 12.5 11.9 - -
19 Romania
Satu Mare, Romania
15.3 17.8 24.8 20.6 12.3 7.7 14.3 15.1 9 10.6 19.3 21.1 22.4 - - - -
20 Romania
Scheia, Romania
15.3 22 25.7 12.8 11.2 4.7 11.2 13.1 9.3 10.2 16.8 20.1 8.9 15 - - -
21 Romania
Bucharest, Romania
14.9 17.9 19.2 16.9 12.6 9.9 12.1 13.3 12.6 11.2 15.8 19.5 17.9 15.5 18.4 20.3 -
22 Romania
Zimnicea, Romania
14.9 18.3 19.1 13.3 12.4 9.2 10.2 15.9 11.7 16 18.3 20 6.8 - - - -
23 Romania
Branistea, Romania
14.8 19.5 15.3 20 11.6 7.3 9.7 11.5 11 14.1 20.8 21.3 6 18 25.9 16.8 -
24 Romania
Pitesti, Romania
14.4 22.3 20.3 19.1 13.5 10.5 12.1 11.4 12.7 9.4 12.7 14.9 20.6 - - - -
25 Romania
Timisoara, Romania
14.3 14.9 20.5 12.8 18.1 10.5 12.3 15.4 13.1 11.2 13.6 16.2 19.7 - - - -
26 Romania
Botosani, Romania
13.9 16.6 17.4 11.5 11.6 8.2 12 13.8 10.4 9.9 16.7 23.4 13.8 - 13.3 14.8 -
27 Romania
Buzau, Romania
13.8 24 24.3 19 13.4 9.6 10.5 8.1 8.4 7.1 11.3 16.8 15.3 - - - -
28 Romania
Bacau, Romania
13.2 17.1 15.4 14.1 12.3 7.2 9.6 9.5 11 9 15.1 15.3 16.8 - - - -
29 Romania
Constanta, Romania
12.1 12.3 18.1 14.3 11 9.4 9.9 12.6 9.3 11.3 13.4 11.3 9.3 - - - -
30 Romania
Sibiu, Romania
9.7 14.7 22.9 13.9 8.3 5.3 6 9.6 7.6 8.1 9.9 9.2 11.4 - - - -
31 Romania
Oradea, Romania
9.6 12.3 17.6 11.1 8 5.3 4.3 5.8 3.9 4.4 5.7 22.3 8.7 - - - -
32 Romania
Braila, Romania
9.3 9.9 17.4 15.7 8.3 6 9.7 9.7 5.7 6.5 11.4 7.6 5.9 - - - -
33 Romania
Galati, Romania
7 11 9.1 4.5 3.5 8.1 6.1 5.3 6.9 7.1 7.6 8 9.1 - - - -

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