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)
54
Moderate
San Jose, California
Last updated: ... (Local time)
Good
Fine
Moderate
Poor
Very poor
Hazardous
10.68 μg/m³
0
12.1
35.5
55.5
250.5
500.5+
47.36 μg/m³
0
55
155
255
425
605+
26.99 ppb
0
55
71
86
201
201+
0.74 ppb
0
36
76
186
605
1005+
3.54 ppb
0
54
101
361
1250
2050+
0.13 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
5.50μg/m³
PM2.5
25.77μg/m³
PM10
18.51ppb
O3
0.80ppb
SO2
3.10ppb
NO2
0.11ppm
CO
AQI 33
Good
6.16μg/m³
PM2.5
27.97μg/m³
PM10
18.90ppb
O3
0.81ppb
SO2
3.72ppb
NO2
0.10ppm
CO
AQI 27
Good
4.50μg/m³
PM2.5
24.09μg/m³
PM10
17.41ppb
O3
0.80ppb
SO2
3.11ppb
NO2
0.12ppm
CO
AQI 33
Good
5.71μg/m³
PM2.5
26.16μg/m³
PM10
18.67ppb
O3
0.81ppb
SO2
3.19ppb
NO2
0.11ppm
CO
AQI 22
Good
3.95μg/m³
PM2.5
21.43μg/m³
PM10
17.36ppb
O3
0.79ppb
SO2
3.28ppb
NO2
0.13ppm
CO
AQI 20
Good
3.24μg/m³
PM2.5
22.14μg/m³
PM10
16.22ppb
O3
0.79ppb
SO2
2.90ppb
NO2
0.13ppm
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 08:00:00 on 2025-07-29.
In the last 24 hours, the best air quality in San Jose, California was observed at 03:00:00 on 2025-07-30.
As of now, the AQI in San Jose, California is 33, 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 5.605 μg/m3.
The PM10 concentration in San Jose, California is 24.349 μg/m3 at the moment.
The current carbon monoxide (CO) concentration in San Jose, California is 0.175 ppm.
Currently, San Jose, California has a sulfur dioxide (SO2) concentration of 0.799 ppb.
The current ozone (O3) level in San Jose, California at the moment is 18.954 ppm.
Nitrogen dioxide (NO2) level in San Jose, California at the moment is 4.039 ppb.
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