Stay updated with real-time air quality in San Jose, 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)
38
Good
San Jose, California
Last updated: ... (Local time)

Good
Fine
Moderate
Poor
Very poor
Hazardous
7.16 μg/m³
0
12.1
35.5
55.5
250.5
500.5+
31.60 μg/m³
0
55
155
255
425
605+
21.97 ppb
0
55
71
86
201
201+
0.42 ppb
0
36
76
186
605
1005+
2.81 ppb
0
54
101
361
1250
2050+
0.23 ppm
0
4.5
9.5
12.5
230.5
50.5+
Pollen Level
Low
San Jose, California
San Jose, California
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AQI 33
Good
6.03μg/m³
PM2.5
26.74μg/m³
PM10
21.67ppb
O3
0.42ppb
SO2
2.97ppb
NO2
0.23ppm
CO
AQI 38
Good
6.82μg/m³
PM2.5
30.28μg/m³
PM10
21.93ppb
O3
0.42ppb
SO2
3.79ppb
NO2
0.28ppm
CO
AQI 27
Good
5.43μg/m³
PM2.5
24.21μg/m³
PM10
21.22ppb
O3
0.41ppb
SO2
3.31ppb
NO2
0.24ppm
CO
AQI 33
Good
6.20μg/m³
PM2.5
27.46μg/m³
PM10
21.72ppb
O3
0.42ppb
SO2
3.02ppb
NO2
0.24ppm
CO
AQI 27
Good
5.39μg/m³
PM2.5
23.96μg/m³
PM10
20.98ppb
O3
0.41ppb
SO2
3.30ppb
NO2
0.25ppm
CO
AQI 27
Good
4.59μg/m³
PM2.5
20.68μg/m³
PM10
20.96ppb
O3
0.41ppb
SO2
3.51ppb
NO2
0.25ppm
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 Jose, California is updated every hour for accuracy.
In the past 24 hours, the air quality in San Jose, California was at its worst at 07:00:00 on 2026-08-15.
In the last 24 hours, the best air quality in San Jose, California was observed at 06:00:00 on 2026-08-16.
As of now, the AQI in San Jose, California is 38, indicating Good conditions.
San Jose, California air has the highest levels of PM2.5.
Poor air quality in San Jose, California means it's advisable to stay indoors and wear a mask for your protection.
PM2.5 levels in San Jose, California are currently 7.159 μg/m3.
The PM10 concentration in San Jose, California is 31.599 μg/m3 at the moment.
The current carbon monoxide (CO) concentration in San Jose, California is 0.226 ppm.
Currently, San Jose, California has a sulfur dioxide (SO2) concentration of 0.416 ppb.
The current ozone (O3) level in San Jose, California at the moment is 21.966 ppm.
Nitrogen dioxide (NO2) level in San Jose, California at the moment is 2.811 ppb.
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