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
7.06 μg/m³
0
12.1
35.5
55.5
250.5
500.5+
31.39 μg/m³
0
55
155
255
425
605+
23.96 ppb
0
55
71
86
201
201+
0.48 ppb
0
36
76
186
605
1005+
4.54 ppb
0
54
101
361
1250
2050+
0.25 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 38
Good
7.09μg/m³
PM2.5
29.43μg/m³
PM10
23.25ppb
O3
0.48ppb
SO2
4.24ppb
NO2
0.25ppm
CO
AQI 38
Good
6.79μg/m³
PM2.5
30.13μg/m³
PM10
23.84ppb
O3
0.48ppb
SO2
5.58ppb
NO2
0.35ppm
CO
AQI 38
Good
7.30μg/m³
PM2.5
26.78μg/m³
PM10
22.20ppb
O3
0.48ppb
SO2
3.90ppb
NO2
0.26ppm
CO
AQI 38
Good
7.09μg/m³
PM2.5
30.01μg/m³
PM10
23.51ppb
O3
0.48ppb
SO2
4.69ppb
NO2
0.28ppm
CO
AQI 38
Good
7.33μg/m³
PM2.5
27.26μg/m³
PM10
21.86ppb
O3
0.48ppb
SO2
3.59ppb
NO2
0.26ppm
CO
AQI 38
Good
7.49μg/m³
PM2.5
22.11μg/m³
PM10
20.43ppb
O3
0.48ppb
SO2
3.29ppb
NO2
0.26ppm
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 2026-09-20.
In the last 24 hours, the best air quality in San Jose, California was observed at 04:00:00 on 2026-09-21.
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 7.061 μg/m3.
The PM10 concentration in San Jose, California is 31.395 μg/m3 at the moment.
The current carbon monoxide (CO) concentration in San Jose, California is 0.251 ppm.
Currently, San Jose, California has a sulfur dioxide (SO2) concentration of 0.484 ppb.
The current ozone (O3) level in San Jose, California at the moment is 23.957 ppm.
Nitrogen dioxide (NO2) level in San Jose, California at the moment is 4.543 ppb.
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