Air Quality in South San Francisco, United States

Cloudy
12.3°C · 85.6% humidity
12.3°
Feels 12.3°
27
Good
Air quality is satisfactory. Enjoy outdoor activities.
74 stations

Nearby Monitoring Stations

AQI Forecast Calibrated
10 4am
10
3
27 7am
20
15
12 10am
9
8
6 1pm
5
5
4 4pm
4
11
10 7pm
10
10
10 10pm
10
10
10 1am
10
10
Station readings
13
18
12
8
CAMS model adj -24
34
34
27
27
27
27
27
27
27
27
27
27
27
27
34
34
34
34
34
34
34
34
34
34
AD 728×90

Air Quality Index Trend

36h · 1 stn

South San Francisco'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 South San Francisco is 1.3× the WHO annual guideline of 5 µg/m³.

85.6%
Humidity
27.1 km/h
Wind WNW
1016.3 hPa
Pressure
0.7
UV Low
GoodModerateUSGUnhealthyVery UnhealthyHazardous

Which pollutant is driving the AQI?

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

What is the weather forecast for South San Francisco?

Temperature & Precipitation

PM2.5 Trend

36h · 1 station
PM2.56.44 µg/m³ ✓ WHO
Good
PM1013.7 µg/m³
Good
UV INDEX0.7
Low
AD 300×250
Station readings (74 stations within 25 km)
6.44
Median
5.62
Average
2.22
Low
13.07
High
PM2.5 µg/m³ · Model: 6.25 · Bias: -0.2

What is the 7-day forecast for South San Francisco?

05-29
15.4° 12.3°
05-30
14.0° 12.3°
05-31
16.6° 13.7°
0.25 mm
06-01
16.5° 12.6°
0.06 mm
06-02
15.0° 11.8°
0.06 mm
06-03
15.5° 11.1°
0.06 mm
06-04
17.1° 11.1°
Both models agree Avg diff: 1.9°C

Where are air quality stations near South San Francisco?

22
California and Cypress Ave
0.4 km PM2.5: 5.3 µg/m³
35
Rise South City Office
0.4 km PM2.5: 8.4 µg/m³
33
Cypress and Pine Playlot
0.5 km PM2.5: 7.9 µg/m³
22
California and Hawthorn Pl
0.5 km PM2.5: 5.2 µg/m³
20
Grand and Magnolia St
1.0 km PM2.5: 4.9 µg/m³
20
Gardiner Park
1.2 km PM2.5: 4.9 µg/m³
22
Orange Memorial Park
1.6 km PM2.5: 5.3 µg/m³
18
Brentwood Park
2.9 km PM2.5: 4.4 µg/m³
22
Buri Buri Park
2.9 km PM2.5: 5.3 µg/m³
22
Belle Air School
3.4 km PM2.5: 5.3 µg/m³

What cities are near South San Francisco?

23 San Bruno 23 Millbrae 25 Visitacion Valley 23 Daly City 23 Pacifica 26 Bayview-Hunters Point 23 Burlingame 24 Noe Valley 24 Mission District 21 Parkside
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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 2026-05-29T14:31 UTC.