Air Quality in Foster City, United States

Windy
18.7°C · 56.4% humidity
18.7°
Feels 18.7°
21
Good
Air quality is satisfactory. Enjoy outdoor activities.
44 stations

Nearby Monitoring Stations

AQI Forecast Calibrated
1 12pm
8
8
21 3pm
17
15
33 6pm
31
30
30 9pm
29
29
29 12am
28
28
28 3am
8
8
1 6am
1
1
1 9am
1
1
Station readings
3
CAMS model adj -26
27
34
34
34
34
34
54
54
54
54
54
54
54
54
54
54
34
34
27
27
27
27
27
27
AD 728×90

Air Quality Index Trend

38h · 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 1.0× the WHO annual guideline of 5 µg/m³.

56.4%
Humidity
61.6 km/h
Wind WNW
1017.9 hPa
Pressure
17.4
UV Extreme
GoodModerateUSGUnhealthyVery UnhealthyHazardous

Which pollutant is driving the AQI?

PM2.5▲
21
5.08 µg/m³
PM10
19
20.55 µg/m³
050100150200300500

What is the weather forecast for Foster City?

Temperature & Precipitation

PM2.5 Trend

38h · 1 station
PM2.55.08 µg/m³ ✓ WHO
Good
PM1020.55 µg/m³
Good
UV INDEX17.4
Extreme
AD 300×250
Station readings (44 stations within 25 km)
5.08
Median
4.26
Average
2.82
Low
19.7
High
PM2.5 µg/m³ · Model: 7.35 · Bias: +2.3

What is the 7-day forecast for Foster City?

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 Foster City?

36
Redwood City, San Mateo, California
10.3 km PM2.5: 8.6 µg/m³
38
Redwood City, San Mateo, California
10.3 km PM2.5: 9.1 µg/m³
13
Emerald Hills
11.6 km PM2.5: 3.2 µg/m³
25
Belle Air School
13.9 km PM2.5: 5.9 µg/m³
28
Parkside Intermediate School (redeployment)
14.5 km PM2.5: 6.6 µg/m³
16
Parkside Intermediate School
14.5 km PM2.5: 3.8 µg/m³
12
Berkeley-Palo Alto
16.0 km PM2.5: 2.8 µg/m³
15
California and Cypress Ave
16.3 km PM2.5: 3.7 µg/m³
19
Cypress and Pine Playlot
16.4 km PM2.5: 4.6 µg/m³
14
Gardiner Park
16.4 km PM2.5: 3.3 µg/m³

What cities are near Foster City?

29 Belmont 18 San Mateo 36 San Carlos 52 Redwood City 16 Burlingame 16 Millbrae 35 Menlo Park 15 San Bruno 17 East Palo Alto 17 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 2026-05-28T22:52 UTC.