Air Quality in San Jose, United States

Cloudy
12.7°C · 78.9% humidity
12.7°
Feels 12.7°
24
Good
Air quality is satisfactory. Enjoy outdoor activities.
8 stations

Nearby Monitoring Stations

AQI Forecast
34 4am
34
34
24 7am
27
22
23 10am
24
25
26 1pm
26
26
27 4pm
27
27
27 7pm
27
27
27 10pm
27
27
27 1am
27
27
AD 728×90

Air Quality Index Trend

46h · 81 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 annual guideline of 5 µg/m³.

78.9%
Humidity
4.5 km/h
Wind WSW
1016.2 hPa
Pressure
0.7
UV Low
GoodModerateUSGUnhealthyVery UnhealthyHazardous

Which pollutant is driving the AQI?

PM2.5▲
24
5.84 µg/m³
PM10
19
20.55 µg/m³
050100150200300500

What is the weather forecast for San Jose?

Temperature & Precipitation

PM2.5 Trend

46h · 81 stations
PM2.55.84 µg/m³ ✓ WHO
Good
PM1020.55 µg/m³
Good
UV INDEX0.7
Low
AD 300×250
Station readings (8 stations within 25 km)
5.84
Median
4.23
Average
2.93
Low
6.0
High
PM2.5 µg/m³ · Model: 7.35 · Bias: +1.5

What is the 7-day forecast for San Jose?

05-29
22.7° 12.7°
05-30
22.0° 15.0°
05-31
28.4° 18.6°
06-01
28.1° 14.0°
06-02
23.5° 13.9°
06-03
28.3° 10.5°
06-04
28.6° 11.7°
Both models agree Avg diff: 3.5°C

Where are air quality stations near San Jose?

25
San Jose - Jackson St, Santa Clara, California
1.0 km PM2.5: 6.0 µg/m³
23
Cristo Rey Jesuit High School
3.0 km PM2.5: 5.4 µg/m³
25
San Jose-Knox Avenue, Santa Clara, California
4.0 km PM2.5: 6.0 µg/m³
57
San Jose-Knox Avenue, Santa Clara, California
4.0 km PM2.5: 15.0 µg/m³
13
Cupertino City Hall
12.0 km PM2.5: 3.2 µg/m³
18
JFK Middle School
14.1 km PM2.5: 4.2 µg/m³
12
Environment Education Center
15.2 km PM2.5: 2.9 µg/m³
13
N Foothhill Blvd
15.4 km PM2.5: 3.1 µg/m³
16
Acterra!
21.1 km PM2.5: 3.9 µg/m³
10
Berkeley-Palo Alto
25.7 km PM2.5: 2.5 µg/m³

What cities are near San Jose?

19 Santa Clara 22 Alum Rock 18 Campbell 20 Milpitas 14 Cupertino 15 Sunnyvale 15 Saratoga 17 Los Gatos 15 Mountain View 15 Los Altos
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Data sources: AQI from ground-level monitoring stations via AQICN. Weather forecast from ECMWF (IFS & CAMS models). AQI calculated using US EPA standard. Updated 2026-05-29T14:29 UTC.