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
18.12 μg/m³
0
12.1
35.5
55.5
250.5
500.5+
26.27 μg/m³
0
55
155
255
425
605+
9.91 ppb
0
55
71
86
201
201+
0.85 ppb
0
36
76
186
605
1005+
22.57 ppb
0
54
101
361
1250
2050+
0.69 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 82
Moderate
25.53μg/m³
PM2.5
31.68μg/m³
PM10
2.86ppb
O3
0.88ppb
SO2
29.59ppb
NO2
0.92ppm
CO
AQI 38
Good
6.59μg/m³
PM2.5
16.52μg/m³
PM10
22.39ppb
O3
0.80ppb
SO2
10.18ppb
NO2
0.32ppm
CO
AQI 86
Moderate
27.93μg/m³
PM2.5
32.85μg/m³
PM10
1.19ppb
O3
0.88ppb
SO2
30.86ppb
NO2
0.99ppm
CO
AQI 49
Good
9.27μg/m³
PM2.5
19.86μg/m³
PM10
17.98ppb
O3
0.77ppb
SO2
14.30ppb
NO2
0.45ppm
CO
AQI 54
Moderate
11.27μg/m³
PM2.5
22.00μg/m³
PM10
15.46ppb
O3
0.77ppb
SO2
16.48ppb
NO2
0.52ppm
CO
AQI 77
Moderate
23.14μg/m³
PM2.5
31.25μg/m³
PM10
3.72ppb
O3
0.90ppb
SO2
29.48ppb
NO2
0.86ppm
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 07:00:00 on 2025-12-07.
In the last 24 hrs, the best air quality in San Dimas, California was observed at 10:00:00 on 2025-12-06.
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 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 18.119 μg/m3.
The current PM10 concentration at San Dimas, California is 26.265 μg/m3.
The current carbon monoxide (CO) concentration at San Dimas, California is 0.688 ppm.
The current sulfur dioxide (SO2) concentration at San Dimas, California is 0.846 ppb.
The current ozone (O3) concentration at San Dimas, California is 9.913 ppm.
The current nitrogen dioxide (NO2) concentration at San Dimas, California is 22.567 ppb.
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