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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Bangkok, Thailand x

2021

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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
1103 Thailand
Bangkok, Thailand
20 42.3 45.2 27 19.7 11.5 8.4 6.9 7.3 10 14.5 18.7 30.6 20.6 22.8 25.2 27.6

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