What is the air quality trend in Fullerton?

Over the past 8 days, Fullerton had an average AQI of 47 based on station measurements. The worst day was 2026-08-01 with AQI 52.

How is Fullerton air quality measured?

Air quality in Fullerton 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 Fullerton, United States

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

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

Current AQI
Moderate CAMS model

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

165h

PM2.5 Station

165h · 166 stations

Temperature GFS model

28pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	PM10 avg	Hours	Stations
2026-08-08	40	38–41	9.5 µg/m³	3.4	5h	166
2026-08-07	45	41–52	10.8 µg/m³	7.8	24h	164
2026-08-06	47	40–63	11.4 µg/m³	9.0	24h	162
2026-08-05	51	42–63	12.9 µg/m³	9.9	24h	159
2026-08-04	52	40–65	13.4 µg/m³	10.1	24h	156
2026-08-03	50	26–59	12.6 µg/m³	9.8	24h	149
2026-08-02	46	42–53	11.1 µg/m³	8.2	24h	150
2026-08-01	52	48–55	12.9 µg/m³	9.4	16h	149

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