Stay updated with real-time air quality in San Diego, 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)
28
Good
San Diego, California
Last updated: ... (Local time)
Good
Fine
Moderate
Poor
Very poor
Hazardous
5.01 μg/m³
0
12.1
35.5
55.5
250.5
500.5+
12.11 μg/m³
0
55
155
255
425
605+
29.98 ppb
0
55
71
86
201
201+
0.35 ppb
0
36
76
186
605
1005+
8.05 ppb
0
54
101
361
1250
2050+
0.26 ppm
0
4.5
9.5
12.5
230.5
50.5+
Pollen Level
Low
San Diego, California
San Diego, California
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AQI 22
Good
4.12μg/m³
PM2.5
10.67μg/m³
PM10
20.50ppb
O3
0.41ppb
SO2
8.66ppb
NO2
0.21ppm
CO
AQI 22
Good
4.16μg/m³
PM2.5
11.53μg/m³
PM10
20.94ppb
O3
0.41ppb
SO2
8.31ppb
NO2
0.20ppm
CO
AQI 22
Good
4.37μg/m³
PM2.5
14.63μg/m³
PM10
22.52ppb
O3
0.41ppb
SO2
7.33ppb
NO2
0.20ppm
CO
AQI 22
Good
3.99μg/m³
PM2.5
11.55μg/m³
PM10
21.42ppb
O3
0.41ppb
SO2
7.20ppb
NO2
0.18ppm
CO
AQI 23
Good
3.96μg/m³
PM2.5
20.66μg/m³
PM10
24.77ppb
O3
0.41ppb
SO2
6.06ppb
NO2
0.21ppm
CO
AQI 22
Good
3.89μg/m³
PM2.5
11.06μg/m³
PM10
21.37ppb
O3
0.41ppb
SO2
6.96ppb
NO2
0.17ppm
CO
Air quality and pollutant data for California, USA are sourced from ground-based monitors and satellites, adhering to US EPA standards. Machine learning and advanced algorithms enhance the data by incorporating local variables like traffic and population density, ensuring high accuracy and dependability.
Source: Ambee Data Sources
The air quality information for San Diego, California is updated every hour for accuracy.
In the past 24 hours, the air quality in San Diego, California was at its worst at 07:00:00 on 2025-07-24.
In the last 24 hours, the best air quality in San Diego, California was observed at 05:00:00 on 2025-07-25.
As of now, the AQI in San Diego, California is 22, indicating Good conditions.
San Diego, California air has the highest levels of PM2.5.
Poor air quality in San Diego, California means it's advisable to stay indoors and wear a mask for your protection.
PM2.5 levels in San Diego, California are currently 4.197 μg/m3.
The PM10 concentration in San Diego, California is 10.119 μg/m3 at the moment.
The current carbon monoxide (CO) concentration in San Diego, California is 0.229 ppm.
Currently, San Diego, California has a sulfur dioxide (SO2) concentration of 0.289 ppb.
The current ozone (O3) level in San Diego, California at the moment is 21.064 ppm.
Nitrogen dioxide (NO2) level in San Diego, California at the moment is 9.142 ppb.
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