What is the air quality trend in South San Francisco?

Over the past 3 days, South San Francisco had an average AQI of 24 based on station measurements. The worst day was 2026-08-08 with AQI 35.

How is South San Francisco air quality measured?

Air quality in South San Francisco is measured by ground-level monitoring stations that report PM2.5 and PM10 concentrations hourly. CERNS.IO aggregates readings from nearby stations and converts PM2.5 to the US EPA Air Quality Index (AQI) scale.

Air Quality History for South San Francisco, United States

Name: South San Francisco Air Quality History
Creator: CERNS.IO
License: https://creativecommons.org/licenses/by/4.0/

Historical PM2.5 and AQI trend from monitoring stations near South San Francisco, United States.

Current AQI
Good Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

44h

PM2.5 Station

44h · 1 station

Temperature GFS model

8pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	PM10 avg	Hours	Stations
2026-08-08	35	16–56	8.7 µg/m³	10.6	6h	1
2026-08-07	19	4–41	4.5 µg/m³	5.5	22h	1
2026-08-06	20	15–25	4.9 µg/m³	5.5	16h	1

Back to South San Francisco Air Quality