California Air Quality

Real-time AQI data and air quality trends for 1,598 cities across California.

Statewide Air Quality Overview

45
Average AQI
5955
Good Air Days
3386
Moderate Days
Unhealthy Days
365
Highest AQI

Based on 2025 EPA data

Cleanest Air in California

1. GazelleMedian AQI: 6
→
2. Lake ShastinaMedian AQI: 6
→
3. Happy CampMedian AQI: 6
→
4. Mount HebronMedian AQI: 6
→
5. HornbrookMedian AQI: 6
→
View All Rankings →

Most Polluted in California

1. TemelecMedian AQI: 9
→
2. GuernevilleMedian AQI: 9
→
3. Santa RosaMedian AQI: 9
→
4. PetalumaMedian AQI: 9
→
5. Bodega BayMedian AQI: 9
→
View All Rankings →

Learn About Air Quality

What Is the AQI?
Understand how the Air Quality Index is calculated and what each level means for your health.
Pollutant Guide
Learn about PM2.5, ozone, and other pollutants that affect air quality across California.
National Rankings
Compare California cities to the rest of the US by air quality grade and median AQI.

All Cities in California

ABCDEFGHIJKLMNOPQRSTUVWYZ

A

B

C

D

E

F

H

L

M

P

R

S

T

W