What is the air quality trend in Fullerton?

Over the past 15 days, Fullerton had an average AQI of 40 based on station measurements. The worst day was 2026-08-30 with AQI 54.

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

333h

PM2.5 Station

333h · 171 stations

Temperature GFS model

56pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	PM10 avg	Hours	Stations
2026-09-05	32	30–37	7.7 µg/m³	5.8	14h	168
2026-09-04	31	25–37	7.5 µg/m³	5.0	24h	169
2026-09-03	37	29–42	8.8 µg/m³	6.5	24h	168
2026-09-02	34	32–39	8.2 µg/m³	6.0	24h	168
2026-09-01	39	34–47	9.3 µg/m³	6.7	24h	161
2026-08-31	50	45–55	12.2 µg/m³	9.6	24h	168
2026-08-30	54	52–56	13.6 µg/m³	10.8	24h	168
2026-08-29	46	35–52	11.1 µg/m³	7.2	24h	168
2026-08-28	45	38–52	10.7 µg/m³	8.6	24h	169
2026-08-27	42	40–45	10.1 µg/m³	7.1	24h	169
2026-08-26	40	33–48	9.6 µg/m³	7.0	24h	169
2026-08-25	39	33–45	9.2 µg/m³	6.5	24h	169
2026-08-24	40	33–46	9.5 µg/m³	5.7	24h	168
2026-08-23	40	35–44	9.5 µg/m³	6.4	24h	169
2026-08-22	42	36–46	10.2 µg/m³	8.0	7h	169

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