Air Quality in San Mateo, United States
Partly Cloudy
21.2°C · 52.6% humidity
21.2°
Feels 21.2°
91
Moderate
Unusually sensitive people should consider reducing prolonged outdoor exertion.
Model forecast
Nearby Monitoring Stations
San Mateo's air quality — share it
AQI Forecast
Calibrated
8
2pm
15
15
91
5pm
69
74
63
8pm
55
49
45
11pm
42
20
19
2am
18
17
9
5am
16
16
16
8am
15
15
15
11am
15
15
Station readings
8
19
CAMS model
adj -19
27
34
34
34
34
54
54
54
54
54
54
34
34
34
34
27
34
34
34
34
34
34
34
34
Air Quality Index Trend
44h · 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. Current PM2.5 concentration in San Mateo is 2.1× the WHO 24-hour guideline of 15 µg/m³.
52.6%
Humidity
30.3 km/h
Wind WNW
1011.2 hPa
Pressure
12.9
UV Extreme
GoodModerateUSGUnhealthyVery UnhealthyHazardous
Which pollutant is driving the AQI?
PM2.5▲
30.95 µg/m³
PM10
84.3 µg/m³
050100150200300500
What is the weather forecast for San Mateo?
Temperature & Precipitation
PM2.5 Trend
44h · 1 stationPM2.530.95 µg/m³
×2.1 WHO
Moderate
PM1084.3 µg/m³
Moderate
UV INDEX12.9
Extreme
What is the 7-day forecast for San Mateo?
08-03
22.8° 13.1°
08-04
21.3° 13.2°
08-05
23.8° 12.2°
08-06
23.1° 12.6°
08-07
21.3° 13.2°
08-08
22.5° 14.3°
08-09
24.3° 12.1°
Both models agree
Avg diff: 2.4°C
Where are air quality stations near San Mateo?
25
Belle Air School
27
Garden Ave Residence
29
Parkside Intermediate School
25
San Bruno School District Office
27
Pacific Ave Residence
22
Brentwood Park
42
Rise South City Office
30
Cypress and Pine Playlot
19
Rollingwood Elementary
28
California and Hawthorn Pl
What cities are near San Mateo?
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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.