Air Quality in San Mateo, United States

Windy
18.7°C · 56.4% humidity
18.7°
Feels 18.7°
16
Good
Air quality is satisfactory. Enjoy outdoor activities.
34 stations

Nearby Monitoring Stations

AQI Forecast Calibrated
5 11am
5
12
16 2pm
12
12
12 5pm
32
32
32 8pm
32
32
32 11pm
32
32
32 2am
32
12
12 5am
5
5
5 8am
5
5
Station readings 6h ago
AQI 4
PM2.5 1.0 µg/m³ · 6h ago
CAMS model adj -22
27
27
34
34
34
34
34
54
54
54
54
54
54
54
54
54
54
34
34
27
27
27
27
27
AD 728×90

Air Quality Index Trend

38h · 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.

56.4%
Humidity
61.6 km/h
Wind WNW
1017.9 hPa
Pressure
19.9
UV Extreme
GoodModerateUSGUnhealthyVery UnhealthyHazardous

Which pollutant is driving the AQI?

PM2.5
16
3.75 µg/m³
PM10▲
19
20.55 µg/m³
050100150200300500

What is the weather forecast for San Mateo?

Temperature & Precipitation

PM2.5 Trend

38h · 1 station
PM2.53.75 µg/m³ ✓ WHO
Good
PM1020.55 µg/m³
Good
UV INDEX19.9
Extreme
AD 300×250
Station readings (34 stations within 25 km)
3.75
Median
3.83
Average
2.83
Low
6.0
High
PM2.5 µg/m³ · Model: 7.35 · Bias: +3.6

What is the 7-day forecast for San Mateo?

05-28
19.5° 9.2°
05-29
18.7° 10.5°
05-30
16.0° 12.4°
05-31
21.7° 14.7°
06-01
21.0° 11.0°
06-02
18.6° 10.3°
06-03
22.2° 8.9°
Both models agree Avg diff: 2.9°C

Where are air quality stations near San Mateo?

25
Belle Air School
9.8 km PM2.5: 5.9 µg/m³
15
Parkside Intermediate School
10.1 km PM2.5: 3.7 µg/m³
28
Parkside Intermediate School (redeployment)
10.1 km PM2.5: 6.6 µg/m³
13
Brentwood Park
12.6 km PM2.5: 3.2 µg/m³
16
California and Cypress Ave
12.8 km PM2.5: 3.8 µg/m³
21
Rise South City Office
12.8 km PM2.5: 5.0 µg/m³
19
Cypress and Pine Playlot
12.8 km PM2.5: 4.6 µg/m³
13
Rollingwood Elementary
12.9 km PM2.5: 3.1 µg/m³
14
California and Hawthorn Pl
13.0 km PM2.5: 3.3 µg/m³
13
Emerald Hills
13.1 km PM2.5: 3.2 µg/m³

What cities are near San Mateo?

15 Burlingame 16 Foster City 16 Belmont 15 Millbrae 17 San Carlos 15 San Bruno 18 Redwood City 17 South San Francisco 14 Pacifica 16 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 2026-05-28T21:47 UTC.