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)
67
Moderate
San Dimas, California
Last updated: ... (Local time)

Good
Fine
Moderate
Poor
Very poor
Hazardous
5.91 μg/m³
0
12.1
35.5
55.5
250.5
500.5+
35.43 μg/m³
0
55
155
255
425
605+
60.42 ppb
0
55
71
86
201
201+
0.94 ppb
0
36
76
186
605
1005+
8.32 ppb
0
54
101
361
1250
2050+
0.30 ppm
0
4.5
9.5
12.5
230.5
50.5+
Pollen Level
High
San Dimas, California
San Dimas, California
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AQI 46
Good
7.94μg/m³
PM2.5
36.00μg/m³
PM10
50.31ppb
O3
1.02ppb
SO2
8.74ppb
NO2
0.31ppm
CO
AQI 74
Moderate
5.33μg/m³
PM2.5
35.95μg/m³
PM10
61.89ppb
O3
0.96ppb
SO2
5.50ppb
NO2
0.30ppm
CO
AQI 61
Moderate
7.22μg/m³
PM2.5
35.56μg/m³
PM10
58.06ppb
O3
0.98ppb
SO2
15.36ppb
NO2
0.31ppm
CO
AQI 71
Moderate
5.60μg/m³
PM2.5
35.06μg/m³
PM10
60.75ppb
O3
0.93ppb
SO2
5.53ppb
NO2
0.30ppm
CO
AQI 67
Moderate
5.71μg/m³
PM2.5
34.68μg/m³
PM10
60.30ppb
O3
0.91ppb
SO2
5.59ppb
NO2
0.30ppm
CO
AQI 49
Good
8.86μg/m³
PM2.5
35.55μg/m³
PM10
50.51ppb
O3
1.05ppb
SO2
8.45ppb
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 01:00:00 on 2026-04-24.
In the last 24 hrs, the best air quality in San Dimas, California was observed at 10:00:00 on 2026-04-23.
The current air quality in San Dimas, California is 67, categorized as Moderate based on real-time data.
The most common pollutant in San Dimas, California is O3.
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 5.905 μg/m3.
The current PM10 concentration at San Dimas, California is 35.434 μg/m3.
The current carbon monoxide (CO) concentration at San Dimas, California is 0.304 ppm.
The current sulfur dioxide (SO2) concentration at San Dimas, California is 0.938 ppb.
The current ozone (O3) concentration at San Dimas, California is 60.424 ppm.
The current nitrogen dioxide (NO2) concentration at San Dimas, California is 8.323 ppb.
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