Air Quality in Foster City, United States

Partly Cloudy
22.8°C · 67.8% humidity
22.8°
Feels 22.8°
24
Good
Air quality is satisfactory. Enjoy outdoor activities.
48 stations

Nearby Monitoring Stations

AQI Forecast Calibrated
11 6am
11
11
24 9am
20
18
16 12pm
14
13
13 3pm
5
5
12 6pm
11
11
11 9pm
11
11
11 12am
11
11
11 3am
11
4
Station readings
10
15
12
CAMS model adj -23
34
34
34
34
34
34
34
34
34
34
27
27
34
34
34
34
34
34
34
34
34
34
34
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.

67.8%
Humidity
10.2 km/h
Wind NNW
1016.6 hPa
Pressure
4.4
UV Moderate
GoodModerateUSGUnhealthyVery UnhealthyHazardous

Which pollutant is driving the AQI?

PM2.5▲
24
5.69 µg/m³
PM10
19
20.55 µg/m³
050100150200300500

What is the weather forecast for Foster City?

Temperature & Precipitation

PM2.5 Trend

42h · 1 station
PM2.55.69 µg/m³ ✓ WHO
Good
PM1020.55 µg/m³
Good
UV INDEX4.4
Moderate
AD 300×250
Station readings (48 stations within 25 km)
5.69
Median
6.01
Average
1.7
Low
8.96
High
PM2.5 µg/m³ · Model: 7.35 · Bias: +1.7

What is the 7-day forecast for Foster City?

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
Both models agree Avg diff: 3.3°C

Where are air quality stations near Foster City?

7
Redwood City, San Mateo, California
10.3 km PM2.5: 1.7 µg/m³
19
Emerald Hills
11.6 km PM2.5: 4.6 µg/m³
23
Belle Air School
13.9 km PM2.5: 5.5 µg/m³
26
Garden Ave Residence
14.0 km PM2.5: 6.3 µg/m³
26
Parkside Intermediate School
14.5 km PM2.5: 6.3 µg/m³
24
San Bruno School District Office
14.6 km PM2.5: 5.8 µg/m³
27
Pacific Ave Residence
15.6 km PM2.5: 6.4 µg/m³
12
Berkeley-Palo Alto
16.0 km PM2.5: 3.0 µg/m³
23
California and Cypress Ave
16.3 km PM2.5: 5.5 µg/m³
38
Cypress and Pine Playlot
16.4 km PM2.5: 9.0 µg/m³

What cities are near Foster City?

20 Belmont 25 San Mateo 18 San Carlos 13 Redwood City 25 Burlingame 25 Millbrae 12 Menlo Park 25 San Bruno 13 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 2026-09-05T16:32 UTC.