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)
33
Good
San Diego, California
Last updated: ... (Local time)

Good
Fine
Moderate
Poor
Very poor
Hazardous
6.44 μg/m³
0
12.1
35.5
55.5
250.5
500.5+
16.91 μg/m³
0
55
155
255
425
605+
9.94 ppb
0
55
71
86
201
201+
0.72 ppb
0
36
76
186
605
1005+
10.85 ppb
0
54
101
361
1250
2050+
0.38 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 38
Good
7.06μg/m³
PM2.5
20.83μg/m³
PM10
9.64ppb
O3
0.72ppb
SO2
10.71ppb
NO2
0.38ppm
CO
AQI 44
Good
8.20μg/m³
PM2.5
28.57μg/m³
PM10
8.75ppb
O3
0.71ppb
SO2
10.40ppb
NO2
0.37ppm
CO
AQI 52
Moderate
9.81μg/m³
PM2.5
39.67μg/m³
PM10
7.31ppb
O3
0.71ppb
SO2
10.04ppb
NO2
0.37ppm
CO
AQI 38
Good
6.97μg/m³
PM2.5
24.60μg/m³
PM10
8.71ppb
O3
0.71ppb
SO2
9.90ppb
NO2
0.38ppm
CO
AQI 52
Moderate
9.74μg/m³
PM2.5
40.02μg/m³
PM10
7.38ppb
O3
0.71ppb
SO2
10.09ppb
NO2
0.37ppm
CO
AQI 33
Good
5.65μg/m³
PM2.5
19.64μg/m³
PM10
8.66ppb
O3
0.71ppb
SO2
9.81ppb
NO2
0.38ppm
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 2026-09-06.
In the last 24 hours, the best air quality in San Diego, California was observed at 12:00:00 on 2026-09-07.
As of now, the AQI in San Diego, California is 33, 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 6.443 μg/m3.
The PM10 concentration in San Diego, California is 16.912 μg/m3 at the moment.
The current carbon monoxide (CO) concentration in San Diego, California is 0.375 ppm.
Currently, San Diego, California has a sulfur dioxide (SO2) concentration of 0.719 ppb.
The current ozone (O3) level in San Diego, California at the moment is 9.936 ppm.
Nitrogen dioxide (NO2) level in San Diego, California at the moment is 10.845 ppb.
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