Air quality in California

Air quality index (AQI) and PM2.5 air pollution in California

Last update at (local time)

LIVE AQI CITY RANKING

Real-time California
Most polluted city ranking

#cityUS AQI
1 Ontario

114

2 Glendora

113

3 Pomona

110

4 Pasadena

108

5 La Canada Flintridge

107

6 La Habra

107

7 South San Jose Hills

106

8 South Pasadena

105

9 Claremont

104

10 Monrovia

104

(local time)

SEE WORLD AQI RANKING

Air Quality Data contributor(s)

Station(s) operated by

Contributors

6024

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LIVE AQI CITY RANKING

Real-time California
Cleanest city ranking

#cityUS AQI
1 Castroville

0

2 Cayucos

0

3 Guerneville

0

4 Opal Cliffs

0

5 Templeton

0

6 Aptos

1

7 Bodega Bay

1

8 Bonny Doon

1

9 Cambria

1

10 Capitola

1

(local time)

SEE WORLD AQI RANKING
Good
Moderate
Unhealthy for sensitive groups
Unhealthy
Very unhealthy
Hazardous
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How to best protect from air pollution?

Reduce your air pollution exposure in California

California air quality data attribution

Contributors 6024

Which is the most polluted city in California?

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