What is the air quality trend in Fremont?

Over the past 7 days, Fremont had an average AQI of 69 based on station measurements. The worst day was 2026-07-16 with AQI 110.

How is Fremont air quality measured?

Air quality in Fremont 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 Fremont, United States

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

Historical PM2.5 and AQI trend from monitoring stations near Fremont, United States.

Current AQI
Good CAMS model

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

113h

PM2.5 Station

113h · 2 stations

Temperature GFS model

28pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-07-21	43	12–75	11.2 µg/m³	16h	2
2026-07-20	60	22–127	18.0 µg/m³	13h	1
2026-07-19	66	17–163	22.8 µg/m³	12h	2
2026-07-18	55	24–180	17.7 µg/m³	19h	2
2026-07-17	109	24–348	70.2 µg/m³	15h	1
2026-07-16	110	17–450	74.9 µg/m³	18h	1
2026-07-15	45	22–57	11.1 µg/m³	20h	1

Back to Fremont Air Quality