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)
52
Moderate
San Diego, California
Last updated: ... (Local time)

Good
Fine
Moderate
Poor
Very poor
Hazardous
10.17 μg/m³
0
12.1
35.5
55.5
250.5
500.5+
26.21 μg/m³
0
55
155
255
425
605+
21.37 ppb
0
55
71
86
201
201+
1.07 ppb
0
36
76
186
605
1005+
12.82 ppb
0
54
101
361
1250
2050+
0.31 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 52
Moderate
10.10μg/m³
PM2.5
27.16μg/m³
PM10
22.69ppb
O3
1.08ppb
SO2
12.24ppb
NO2
0.31ppm
CO
AQI 52
Moderate
9.91μg/m³
PM2.5
27.75μg/m³
PM10
25.55ppb
O3
1.08ppb
SO2
10.63ppb
NO2
0.31ppm
CO
AQI 52
Moderate
9.61μg/m³
PM2.5
27.46μg/m³
PM10
29.93ppb
O3
1.08ppb
SO2
8.23ppb
NO2
0.31ppm
CO
AQI 49
Good
9.38μg/m³
PM2.5
27.61μg/m³
PM10
25.18ppb
O3
1.08ppb
SO2
11.28ppb
NO2
0.31ppm
CO
AQI 52
Moderate
9.57μg/m³
PM2.5
28.10μg/m³
PM10
29.38ppb
O3
1.09ppb
SO2
8.85ppb
NO2
0.31ppm
CO
AQI 49
Good
8.97μg/m³
PM2.5
25.42μg/m³
PM10
24.40ppb
O3
1.08ppb
SO2
12.33ppb
NO2
0.31ppm
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 03:00:00 on 2026-07-24.
In the last 24 hours, the best air quality in San Diego, California was observed at 07:00:00 on 2026-07-23.
As of now, the AQI in San Diego, California is 52, 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 10.174 μg/m3.
The PM10 concentration in San Diego, California is 26.214 μg/m3 at the moment.
The current carbon monoxide (CO) concentration in San Diego, California is 0.311 ppm.
Currently, San Diego, California has a sulfur dioxide (SO2) concentration of 1.074 ppb.
The current ozone (O3) level in San Diego, California at the moment is 21.369 ppm.
Nitrogen dioxide (NO2) level in San Diego, California at the moment is 12.825 ppb.
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