Air Quality in San Mateo, United States
Partly Cloudy
22.8°C · 67.8% humidity
22.8°
Feels 22.8°
26
Good
Air quality is satisfactory. Enjoy outdoor activities.
37 stations
Nearby Monitoring Stations
AQI Forecast
Calibrated
10
5am
10
10
26
8am
21
18
16
11am
14
13
12
2pm
12
4
4
5pm
11
10
10
8pm
10
10
10
11pm
10
10
10
2am
10
10
Station readings
8
10
15
CAMS model
adj -24
34
34
34
34
34
34
34
34
34
34
34
27
27
34
34
34
34
34
34
34
34
34
34
34
Air Quality Index Trend
42h · 1 stnSan 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.
67.8%
Humidity
10.2 km/h
Wind NNW
1016.6 hPa
Pressure
1.4
UV Low
GoodModerateUSGUnhealthyVery UnhealthyHazardous
Which pollutant is driving the AQI?
PM2.5▲
6.21 µg/m³
PM10
20.55 µg/m³
050100150200300500
What is the weather forecast for San Mateo?
Temperature & Precipitation
PM2.5 Trend
42h · 1 stationPM2.56.21 µg/m³
✓ WHO
Good
PM1020.55 µg/m³
Good
UV INDEX1.4
Low
Station readings (37 stations within 25 km)
6.21
Median
6.19
Average
2.98
Low
12.0
High
PM2.5 µg/m³ · Model: 7.1 · Bias: +0.9
What is the 7-day forecast for San Mateo?
09-05
25.7° 13.0°
09-06
26.7° 14.7°
09-07
28.3° 11.0°
09-08
27.4° 12.3°
09-09
24.8° 15.3°
09-10
24.4° 13.4°
09-11
21.2° 14.6°
0.13 mm
Both models agree
Avg diff: 3.3°C
Where are air quality stations near San Mateo?
23
Belle Air School
26
Garden Ave Residence
26
Parkside Intermediate School
24
San Bruno School District Office
26
Pacific Ave Residence
20
Brentwood Park
23
California and Cypress Ave
29
Rise South City Office
37
Cypress and Pine Playlot
22
Rollingwood Elementary
What cities are near San Mateo?
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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 2026-09-05T15:10 UTC.