What is the air quality trend in Fullerton?

Over the past 7 days, Fullerton had an average AQI of 33 based on station measurements. The worst day was 2026-05-22 with AQI 51.

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

168h

PM2.5 Station

168h · 2 stations

Temperature GFS model

27pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	PM10 avg	Hours	Stations
2026-05-28	18	3–40	4.4 µg/m³	2.3	24h	152
2026-05-27	22	20–31	5.2 µg/m³	3.2	24h	173
2026-05-26	24	23–27	5.8 µg/m³	4.3	24h	173
2026-05-25	28	26–34	6.8 µg/m³	5.0	24h	173
2026-05-24	39	34–45	9.5 µg/m³	8.7	24h	173
2026-05-23	49	42–53	11.8 µg/m³	9.5	24h	172
2026-05-22	51	28–59	12.7 µg/m³	10.0	24h	159

Back to Fullerton Air Quality