What is the air quality trend in Lake Forest?

Over the past 8 days, Lake Forest had an average AQI of 48 based on station measurements. The worst day was 2026-06-05 with AQI 63.

How is Lake Forest air quality measured?

Air quality in Lake Forest 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 Lake Forest, United States

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

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

Current AQI
Good Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

165h

PM2.5 Station

165h · 31 stations

Temperature GFS model

28pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-06-09	37	37–37	8.9 µg/m³	1h	31
2026-06-08	39	33–48	9.4 µg/m³	24h	29
2026-06-07	38	35–41	9.2 µg/m³	24h	30
2026-06-06	49	43–55	11.8 µg/m³	23h	30
2026-06-05	63	53–74	17.7 µg/m³	24h	30
2026-06-04	54	44–65	13.9 µg/m³	24h	30
2026-06-03	53	35–68	14.0 µg/m³	24h	30
2026-06-02	54	43–61	13.7 µg/m³	21h	30

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