Air Quality in San Jose, United States

Clear
24.9°C · 36.1% humidity
24.9°
Feels 24.9°
63
Moderate
Unusually sensitive people should consider reducing prolonged outdoor exertion.
Model forecast

Nearby Monitoring Stations

AQI Forecast
34 2pm
34
34
63 5pm
60
59
57 8pm
56
56
55 11pm
55
55
54 2am
54
54
54 5am
54
54
54 8am
54
34
34 11am
34
34
AD 728×90

Air Quality Index Trend

45h · 77 stn

San Jose's air quality is primarily affected by vehicle emissions and industrial activity. Seasonal wildfire smoke and weather patterns can cause periodic air quality deterioration. Current PM2.5 concentration in San Jose is 1.2× the WHO 24-hour guideline of 15 µg/m³.

36.1%
Humidity
20.6 km/h
Wind WNW
1010.9 hPa
Pressure
17.4
UV Extreme
GoodModerateUSGUnhealthyVery UnhealthyHazardous

Which pollutant is driving the AQI?

PM2.5▲
63
17.65 µg/m³
PM10
38
41.15 µg/m³
050100150200300500

What is the weather forecast for San Jose?

Temperature & Precipitation

PM2.5 Trend

45h · 77 stations
PM2.517.65 µg/m³ ×1.2 WHO
Moderate
PM1041.15 µg/m³
Good
UV INDEX17.4
Extreme
AD 300×250

What is the 7-day forecast for San Jose?

08-03
28.5° 15.9°
08-04
28.0° 18.9°
08-05
28.2° 15.2°
08-06
29.4° 16.2°
08-07
25.6° 19.1°
08-08
28.2° 15.9°
08-09
29.5° 16.1°
Both models agree Avg diff: 1.9°C

Where are air quality stations near San Jose?

55
San Jose - Jackson St, Santa Clara, California
1.0 km PM2.5: 14.0 µg/m³
59
San Jose - Jackson St, Santa Clara, California
1.0 km PM2.5: 15.9 µg/m³
48
Cristo Rey Jesuit High School
3.0 km PM2.5: 11.4 µg/m³
53
San Jose-Knox Avenue, Santa Clara, California
4.0 km PM2.5: 13.1 µg/m³
57
San Jose-Knox Avenue, Santa Clara, California
4.0 km PM2.5: 15.0 µg/m³
38
San Jose-Knox Avenue, Santa Clara, California
4.0 km PM2.5: 9.1 µg/m³
37
Cupertino City Hall
12.0 km PM2.5: 8.9 µg/m³
53
JFK Middle School
14.1 km PM2.5: 13.1 µg/m³
35
Environment Education Center
15.2 km PM2.5: 8.5 µg/m³
39
N Foothhill Blvd
15.4 km PM2.5: 9.3 µg/m³

What cities are near San Jose?

64 Santa Clara 63 Alum Rock 63 Campbell 69 Milpitas 64 Cupertino 64 Sunnyvale 63 Saratoga 63 Los Gatos 64 Mountain View 63 Los Altos
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Data sources: Weather forecast from ECMWF (IFS & CAMS models). AQI calculated using US EPA standard. Updated 2026-08-08T00:00 UTC.