What is the air quality trend in Fallbrook?

Over the past 8 days, Fallbrook had an average AQI of 42 based on station measurements. The worst day was 2026-08-05 with AQI 58.

How is Fallbrook air quality measured?

Air quality in Fallbrook 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 Fallbrook, United States

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

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

Current AQI
Moderate CAMS model

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

166h

PM2.5 Station

166h · 3 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	29	21–33	7.0 µg/m³	2.8	4h	3
2026-08-07	39	13–107	10.6 µg/m³	6.5	24h	2
2026-08-06	46	7–126	13.0 µg/m³	6.6	24h	2
2026-08-05	58	16–151	17.4 µg/m³	12.9	24h	2
2026-08-04	50	10–157	16.2 µg/m³	7.1	24h	2
2026-08-03	42	4–100	11.1 µg/m³	9.5	24h	2
2026-08-02	40	8–62	9.9 µg/m³	9.3	24h	2
2026-08-01	37	10–57	8.9 µg/m³	7.2	18h	2

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