World's most polluted cities 2020 (PM2.5)

The most polluted cities according to data aggregated from over 80,000 data points.

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Cupertino, USA x

2020

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World air quality report

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2020 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 2020 AVG JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 2019 AVG 2018 AVG 2017 AVG
2880 USA
Cupertino, USA
9.4 3.9 6.5 3.7 3 3 3.9 6.1 20.9 27 15.7 7.5 7.6 5.6 - -

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