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)
54
Moderate
San Diego, California
Last updated: ... (Local time)

Good
Fine
Moderate
Poor
Very poor
Hazardous
11.40 μg/m³
0
12.1
35.5
55.5
250.5
500.5+
24.34 μg/m³
0
55
155
255
425
605+
22.94 ppb
0
55
71
86
201
201+
0.74 ppb
0
36
76
186
605
1005+
19.66 ppb
0
54
101
361
1250
2050+
0.49 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 54
Moderate
11.37μg/m³
PM2.5
24.71μg/m³
PM10
21.07ppb
O3
0.76ppb
SO2
15.48ppb
NO2
0.57ppm
CO
AQI 54
Moderate
11.45μg/m³
PM2.5
25.62μg/m³
PM10
18.81ppb
O3
0.75ppb
SO2
16.50ppb
NO2
0.57ppm
CO
AQI 56
Moderate
11.68μg/m³
PM2.5
26.11μg/m³
PM10
15.14ppb
O3
0.75ppb
SO2
18.28ppb
NO2
0.57ppm
CO
AQI 54
Moderate
10.89μg/m³
PM2.5
25.83μg/m³
PM10
19.07ppb
O3
0.76ppb
SO2
16.15ppb
NO2
0.57ppm
CO
AQI 56
Moderate
11.79μg/m³
PM2.5
29.16μg/m³
PM10
15.78ppb
O3
0.75ppb
SO2
18.06ppb
NO2
0.57ppm
CO
AQI 54
Moderate
10.75μg/m³
PM2.5
25.71μg/m³
PM10
19.37ppb
O3
0.76ppb
SO2
16.10ppb
NO2
0.57ppm
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 09:00:00 on 2026-08-18.
In the last 24 hours, the best air quality in San Diego, California was observed at 03:00:00 on 2026-08-18.
As of now, the AQI in San Diego, California is 54, indicating Moderate 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 11.396 μg/m3.
The PM10 concentration in San Diego, California is 24.337 μg/m3 at the moment.
The current carbon monoxide (CO) concentration in San Diego, California is 0.492 ppm.
Currently, San Diego, California has a sulfur dioxide (SO2) concentration of 0.741 ppb.
The current ozone (O3) level in San Diego, California at the moment is 22.936 ppm.
Nitrogen dioxide (NO2) level in San Diego, California at the moment is 19.663 ppb.
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