Air Quality in San Mateo, United States

Clear
25.0°C · 40.2% humidity
25.0°
Feels 25.0°
28
Good
Air quality is satisfactory. Enjoy outdoor activities.
37 stations

Nearby Monitoring Stations

AQI Forecast Calibrated
14 7am
14
14
28 10am
24
21
19 1pm
18
17
23 4pm
22
22
22 7pm
21
21
21 10pm
21
21
21 1am
21
21
21 4am
21
14
Station readings
3
3
9
CAMS model adj -13
27
27
27
27
27
27
27
27
27
34
34
34
34
34
34
34
34
34
34
34
34
34
34
27
AD 728×90

Air Quality Index Trend

36h · 1 stn

San Mateo's air quality is primarily affected by vehicle emissions and industrial activity. Seasonal wildfire smoke and weather patterns can cause periodic air quality deterioration.

40.2%
Humidity
32.4 km/h
Wind NW
1008.9 hPa
Pressure
9.4
UV Very High
GoodModerateUSGUnhealthyVery UnhealthyHazardous

Which pollutant is driving the AQI?

PM2.5▲
28
6.73 µg/m³
PM10
13
13.7 µg/m³
050100150200300500

What is the weather forecast for San Mateo?

Temperature & Precipitation

PM2.5 Trend

36h · 1 station
PM2.56.73 µg/m³ ✓ WHO
Good
PM1013.7 µg/m³
Good
UV INDEX9.4
Very High
AD 300×250
Station readings (37 stations within 25 km)
6.73
Median
6.88
Average
4.14
Low
12.2
High
PM2.5 µg/m³ · Model: 6.25 · Bias: -0.5

What is the 7-day forecast for San Mateo?

07-21
25.0° 11.5°
07-22
25.5° 14.2°
07-23
22.5° 16.4°
07-24
29.3° 12.6°
07-25
22.5° 14.3°
07-26
27.7° 11.8°
07-27
25.0° 12.1°
Both models agree Avg diff: 2.6°C

Where are air quality stations near San Mateo?

27
Belle Air School
9.8 km PM2.5: 6.5 µg/m³
30
Garden Ave Residence
9.8 km PM2.5: 7.3 µg/m³
28
Parkside Intermediate School
10.1 km PM2.5: 6.8 µg/m³
28
Parkside Intermediate School (redeployment)
10.1 km PM2.5: 6.6 µg/m³
28
San Bruno School District Office
10.3 km PM2.5: 6.7 µg/m³
28
Pacific Ave Residence
11.6 km PM2.5: 6.7 µg/m³
22
Brentwood Park
12.6 km PM2.5: 5.3 µg/m³
27
California and Cypress Ave
12.8 km PM2.5: 6.4 µg/m³
51
Rise South City Office
12.8 km PM2.5: 12.2 µg/m³
34
Cypress and Pine Playlot
12.8 km PM2.5: 8.1 µg/m³

What cities are near San Mateo?

28 Burlingame 29 Foster City 26 Belmont 28 Millbrae 25 San Carlos 28 San Bruno 23 Redwood City 32 South San Francisco 25 Pacifica 19 Menlo Park
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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 2026-07-21T17:15 UTC.