Air Quality in San Mateo, United States

Partly Cloudy
22.8°C · 67.8% humidity
22.8°
Feels 22.8°
25
Good
Air quality is satisfactory. Enjoy outdoor activities.
39 stations

Nearby Monitoring Stations

AQI Forecast Calibrated
10 7am
10
10
25 10am
21
18
16 1pm
14
13
5 4pm
4
11
11 7pm
11
10
10 10pm
10
10
10 1am
10
10
10 4am
3
10
Station readings
15
12
9
CAMS model adj -24
34
34
34
34
34
34
34
34
34
27
27
34
34
34
34
34
34
34
34
34
34
34
27
34
AD 728×90

Air Quality Index Trend

42h · 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.

67.8%
Humidity
10.2 km/h
Wind NNW
1016.6 hPa
Pressure
7.9
UV Very High
GoodModerateUSGUnhealthyVery UnhealthyHazardous
PM2.5
25
5.93 µg/m³
PM10
19
20.55 µg/m³
050100150200300500

Temperature & Precipitation

PM2.5 Trend

42h · 1 station
PM2.55.93 µg/m³ ✓ WHO
Good
PM1020.55 µg/m³
Good
UV INDEX7.9
Very High
AD 300×250
5.93
Median
5.99
Average
3.17
Low
10.92
High
PM2.5 µg/m³ · Model: 7.1 · Bias: +1.2
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
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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 2026-09-05T17:30 UTC.