Highest risk cities in California
Highest air quality risk cities in California
Ranked city list for poor air quality and smoke stress. Open any city to view local risk details and live outlook context.
State average
AQI score
28/100
Updated Sun, Aug 9, 12:58 AM.
More state ranking pages
Highest overall weather risk citiesHighest flood risk citiesHighest wind risk citiesHighest lightning risk citiesHighest wildfire risk citiesHighest tornado risk citiesRanked cities
Top 25 cities by aqi score.
#1
Cool, CA
67 points above the state average
#2
Colton, CA
4 points above the state average
#3
Fontana, CA
4 points above the state average
#4
Jurupa Valley, CA
4 points above the state average
#5
Rancho Cucamonga, CA
4 points above the state average
#6
Riverside, CA
4 points above the state average
#7
Chino, CA
3 points above the state average
#8
Clovis, CA
3 points above the state average
#9
Corona, CA
3 points above the state average
#10
Eastvale, CA
3 points above the state average
#11
Fountain Valley, CA
3 points above the state average
#12
Fullerton, CA
3 points above the state average
#13
Garden Grove, CA
3 points above the state average
#14
Hacienda Heights, CA
3 points above the state average
#15
La Habra, CA
3 points above the state average
#16
Moreno Valley, CA
3 points above the state average
#17
Ontario, CA
3 points above the state average
#18
Orange, CA
3 points above the state average
#19
Placentia, CA
3 points above the state average
#20
Upland, CA
3 points above the state average
#21
Westminster, CA
3 points above the state average
#22
Buena Park, CA
2 points above the state average
#23
Cerritos, CA
2 points above the state average
#24
Cypress, CA
2 points above the state average
#25
Hanford, CA
2 points above the state average
How this ranking works
Rankings use HomeRiskIQ weather risk data and statewide score snapshots.
Scores are normalized to a 0-100 scale and shown against the state average for context.
City entries link to hazard-specific pages where available, otherwise to the city overview.