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)
44
Good
San Jose, California
Last updated: ... (Local time)

Good
Fine
Moderate
Poor
Very poor
Hazardous
5.75 μg/m³
0
12.1
35.5
55.5
250.5
500.5+
25.33 μg/m³
0
55
155
255
425
605+
47.88 ppb
0
55
71
86
201
201+
0.53 ppb
0
36
76
186
605
1005+
4.53 ppb
0
54
101
361
1250
2050+
0.23 ppm
0
4.5
9.5
12.5
230.5
50.5+
Pollen Level
Moderate
San Jose, California
San Jose, California
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AQI 43
Good
5.89μg/m³
PM2.5
25.66μg/m³
PM10
46.11ppb
O3
0.53ppb
SO2
4.37ppb
NO2
0.23ppm
CO
AQI 44
Good
6.78μg/m³
PM2.5
29.70μg/m³
PM10
47.48ppb
O3
0.53ppb
SO2
7.94ppb
NO2
0.27ppm
CO
AQI 40
Good
6.40μg/m³
PM2.5
26.96μg/m³
PM10
43.03ppb
O3
0.54ppb
SO2
4.59ppb
NO2
0.24ppm
CO
AQI 44
Good
6.09μg/m³
PM2.5
26.80μg/m³
PM10
46.66ppb
O3
0.52ppb
SO2
5.14ppb
NO2
0.24ppm
CO
AQI 39
Good
6.21μg/m³
PM2.5
26.16μg/m³
PM10
41.59ppb
O3
0.53ppb
SO2
4.39ppb
NO2
0.25ppm
CO
AQI 38
Good
6.73μg/m³
PM2.5
27.27μg/m³
PM10
39.56ppb
O3
0.54ppb
SO2
4.16ppb
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 09:00:00 on 2026-04-24.
In the last 24 hours, the best air quality in San Jose, California was observed at 04:00:00 on 2026-04-24.
As of now, the AQI in San Jose, California is 44, indicating Good conditions.
San Jose, California air has the highest levels of O3.
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 5.749 μg/m3.
The PM10 concentration in San Jose, California is 25.333 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 0.534 ppb.
The current ozone (O3) level in San Jose, California at the moment is 47.879 ppm.
Nitrogen dioxide (NO2) level in San Jose, California at the moment is 4.53 ppb.
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