What is the air quality trend in Fullerton?

Over the past 8 days, Fullerton had an average AQI of 25 based on station measurements. The worst day was 2026-10-20 with AQI 34.

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
Good CAMS model

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

166h

PM2.5 Station

166h · 165 stations

Temperature GFS model

28pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	PM10 avg	Hours	Stations
2026-10-20	34	21–45	8.1 µg/m³	5.6	20h	141
2026-10-19	28	21–35	6.7 µg/m³	4.3	24h	166
2026-10-18	24	12–32	5.8 µg/m³	3.7	24h	153
2026-10-17	23	15–29	5.5 µg/m³	3.8	24h	164
2026-10-16	23	15–30	5.5 µg/m³	3.8	24h	157
2026-10-15	25	16–33	6.0 µg/m³	4.2	24h	164
2026-10-14	24	18–27	5.7 µg/m³	3.7	24h	163
2026-10-13	23	23–23	5.5 µg/m³	4.8	2h	166

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