Stay updated with real-time air quality in San Dimas, California featuring accurate data on AQI, PM2.5, PM10, O3, NO2, SO2, and CO levels. Use our interactive map and detailed forecasts to monitor pollution trends, manage health risks, and plan your daily activities with confidence.
Live AQI (Air Quality Index)
52
Moderate
San Dimas, California
Last updated: ... (Local time)

Good
Fine
Moderate
Poor
Very poor
Hazardous
10.19 μg/m³
0
12.1
35.5
55.5
250.5
500.5+
21.85 μg/m³
0
55
155
255
425
605+
31.73 ppb
0
55
71
86
201
201+
0.52 ppb
0
36
76
186
605
1005+
7.75 ppb
0
54
101
361
1250
2050+
0.28 ppm
0
4.5
9.5
12.5
230.5
50.5+
Pollen Level
Low
San Dimas, California
San Dimas, California
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AQI 44
Good
7.78μg/m³
PM2.5
25.81μg/m³
PM10
22.96ppb
O3
0.51ppb
SO2
11.18ppb
NO2
0.30ppm
CO
AQI 38
Good
7.17μg/m³
PM2.5
19.97μg/m³
PM10
25.99ppb
O3
0.48ppb
SO2
6.11ppb
NO2
0.30ppm
CO
AQI 44
Good
7.79μg/m³
PM2.5
23.31μg/m³
PM10
24.16ppb
O3
0.56ppb
SO2
12.34ppb
NO2
0.30ppm
CO
AQI 38
Good
6.55μg/m³
PM2.5
19.41μg/m³
PM10
25.89ppb
O3
0.46ppb
SO2
5.57ppb
NO2
0.29ppm
CO
AQI 33
Good
6.36μg/m³
PM2.5
19.23μg/m³
PM10
25.85ppb
O3
0.45ppb
SO2
5.36ppb
NO2
0.29ppm
CO
AQI 38
Good
6.98μg/m³
PM2.5
19.09μg/m³
PM10
23.11ppb
O3
0.55ppb
SO2
15.55ppb
NO2
0.30ppm
CO
Air quality data and pollutant measurements for California, USA adhere to strict US EPA standards. The data is collected from multiple reliable sources, including satellites and ground-based monitoring stations. This data is further analyzed and enhanced using machine learning and advanced algorithms that factor in elements such as traffic and population density, ensuring accurate and reliable results.
Source: Ambee Data Sources
The air quality for San Dimas, California is updated every hour.
The worst air quality in San Dimas, California in the last 24 hours was observed at 10:00:00 on 2026-08-13.
In the last 24 hrs, the best air quality in San Dimas, California was observed at 09:00:00 on 2026-08-14.
The current air quality in San Dimas, California is 38, categorized as Good based on real-time data.
The most common pollutant in San Dimas, California is PM2.5.
If the air quality in San Dimas, California is poor, consider staying indoors and wearing a mask to protect yourself.
The current PM2.5 concentration at San Dimas, California is 7.136 μg/m3.
The current PM10 concentration at San Dimas, California is 20.422 μg/m3.
The current carbon monoxide (CO) concentration at San Dimas, California is 0.299 ppm.
The current sulfur dioxide (SO2) concentration at San Dimas, California is 0.49 ppb.
The current ozone (O3) concentration at San Dimas, California is 25.57 ppm.
The current nitrogen dioxide (NO2) concentration at San Dimas, California is 7.549 ppb.
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