Air Quality in Foster City, United States

Partly Cloudy
21.2°C · 52.6% humidity
21.2°
Feels 21.2°
64
Moderate
Unusually sensitive people should consider reducing prolonged outdoor exertion.
Model forecast

Nearby Monitoring Stations

AQI Forecast Calibrated
15 3pm
15
15
64 6pm
70
60
53 9pm
48
44
42 12am
20
18
17 3am
17
9
16 6am
16
15
15 9am
15
15
15 12pm
15
15
Station readings
19
23
CAMS model adj -19
34
34
34
34
54
54
54
54
54
54
34
34
34
34
27
34
34
34
34
34
34
34
34
34
AD 728×90

Air Quality Index Trend

44h · 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. Current PM2.5 concentration in Foster City is 1.2× 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▲
64
18.1 µg/m³
PM10
53
59.3 µg/m³
050100150200300500

What is the weather forecast for Foster City?

Temperature & Precipitation

PM2.5 Trend

44h · 1 station
PM2.518.1 µg/m³ ×1.2 WHO
Moderate
PM1059.3 µg/m³
Moderate
UV INDEX12.9
Extreme
AD 300×250

What is the 7-day forecast for Foster City?

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 Foster City?

3
Redwood City, San Mateo, California
10.3 km PM2.5: 0.7 µg/m³
31
Emerald Hills
11.6 km PM2.5: 7.4 µg/m³
24
Belle Air School
13.9 km PM2.5: 5.7 µg/m³
26
Garden Ave Residence
14.0 km PM2.5: 6.2 µg/m³
28
Parkside Intermediate School
14.5 km PM2.5: 6.6 µg/m³
24
San Bruno School District Office
14.6 km PM2.5: 5.8 µg/m³
30
Pacific Ave Residence
15.6 km PM2.5: 7.2 µg/m³
25
Berkeley-Palo Alto
16.0 km PM2.5: 5.9 µg/m³
28
Cypress and Pine Playlot
16.4 km PM2.5: 6.8 µg/m³
23
Gardiner Park
16.4 km PM2.5: 5.4 µg/m³

What cities are near Foster City?

64 Belmont 91 San Mateo 64 San Carlos 63 Redwood City 4 Burlingame 4 Millbrae 68 Menlo Park 4 San Bruno 68 East Palo Alto 4 South San Francisco
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Data sources: Weather forecast from ECMWF (IFS & CAMS models). AQI calculated using US EPA standard. Updated 2026-08-08T01:01 UTC.