What is the air quality trend in Lake Forest?

Over the past 11 days, Lake Forest had an average AQI of 11 based on station measurements. The worst day was 2026-07-31 with AQI 40.

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
Moderate Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

77h

PM2.5 Station

77h · 1 station

Temperature GFS model

56pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	PM10 avg	Hours	Stations
2026-08-07	2	2–2	0.4 µg/m³	1.4	1h	1
2026-08-06	4	3–4	0.8 µg/m³	1.1	2h	1
2026-08-04	14	5–23	2.6 µg/m³	3.0	5h	1
2026-08-03	4	4–4	1.0 µg/m³	1.0	1h	1
2026-08-02	9	3–17	2.1 µg/m³	2.3	22h	1
2026-08-01	8	4–19	2.0 µg/m³	2.3	11h	1
2026-07-31	40	29–46	9.5 µg/m³	—	4h	2
2026-07-30	8	4–13	2.0 µg/m³	2.2	7h	1
2026-07-28	4	2–6	1.0 µg/m³	1.3	5h	1
2026-07-26	4	3–6	1.0 µg/m³	1.3	2h	1
2026-07-25	30	8–53	7.3 µg/m³	7.8	17h	1

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