Air Quality in Foster City, United States

Windy
25.5°C · 36.1% humidity
25.5°
Feels 25.5°
27
Good
Air quality is satisfactory. Enjoy outdoor activities.
49 stations

Nearby Monitoring Stations

AQI Forecast Calibrated
12 1pm
12
12
27 4pm
25
23
22 7pm
21
21
20 10pm
20
20
19 1am
19
19
19 4am
19
12
12 7am
12
12
12 10am
12
12
Station readings
15
12
11
CAMS model adj -15
27
27
27
34
34
34
34
34
34
34
34
34
34
34
34
34
34
27
27
27
27
27
27
27
AD 728×90

Air Quality Index Trend

42h · 1 stn

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

36.1%
Humidity
49.0 km/h
Wind WNW
1007.2 hPa
Pressure
14.9
UV Extreme
GoodModerateUSGUnhealthyVery UnhealthyHazardous

Which pollutant is driving the AQI?

PM2.5▲
27
6.42 µg/m³
PM10
13
13.7 µg/m³
050100150200300500

What is the weather forecast for Foster City?

Temperature & Precipitation

PM2.5 Trend

42h · 1 station
PM2.56.42 µg/m³ ✓ WHO
Good
PM1013.7 µg/m³
Good
UV INDEX14.9
Extreme
AD 300×250
Station readings (49 stations within 25 km)
6.42
Median
6.38
Average
3.55
Low
9.46
High
PM2.5 µg/m³ · Model: 6.5 · Bias: +0.1

What is the 7-day forecast for Foster City?

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 Foster City?

47
Redwood City, San Mateo, California
10.3 km PM2.5: 11.3 µg/m³
70
Redwood City, San Mateo, California
10.3 km PM2.5: 21.1 µg/m³
24
Emerald Hills
11.6 km PM2.5: 5.8 µg/m³
19
Belle Air School
13.9 km PM2.5: 4.6 µg/m³
26
Garden Ave Residence
14.0 km PM2.5: 6.3 µg/m³
28
Parkside Intermediate School (redeployment)
14.5 km PM2.5: 6.6 µg/m³
19
Parkside Intermediate School
14.5 km PM2.5: 4.6 µg/m³
20
San Bruno School District Office
14.6 km PM2.5: 4.7 µg/m³
28
Pacific Ave Residence
15.6 km PM2.5: 6.6 µg/m³
23
Berkeley-Palo Alto
16.0 km PM2.5: 5.4 µg/m³

What cities are near Foster City?

27 Belmont 26 San Mateo 28 San Carlos 31 Redwood City 25 Burlingame 25 Millbrae 28 Menlo Park 25 San Bruno 24 East Palo Alto 28 South San Francisco
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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 2026-07-21T23:13 UTC.