What is the air quality trend in Lake Forest?

Over the past 15 days, Lake Forest had an average AQI of 50 based on station measurements. The worst day was 2026-08-04 with AQI 56.

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 CAMS model

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

333h

PM2.5 Station

333h · 26 stations

Temperature GFS model

56pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-08-08	43	40–46	10.4 µg/m³	2h	25
2026-08-07	48	40–66	11.9 µg/m³	24h	25
2026-08-06	52	43–63	12.8 µg/m³	24h	25
2026-08-05	56	42–75	15.0 µg/m³	24h	24
2026-08-04	56	40–90	15.0 µg/m³	24h	24
2026-08-03	54	40–64	13.9 µg/m³	24h	23
2026-08-02	50	42–61	12.3 µg/m³	24h	22
2026-08-01	54	48–60	13.4 µg/m³	24h	22
2026-07-31	55	45–64	14.2 µg/m³	24h	23
2026-07-30	51	39–58	12.6 µg/m³	24h	22
2026-07-29	49	43–56	11.8 µg/m³	24h	23
2026-07-28	50	36–152	13.0 µg/m³	24h	23
2026-07-27	44	35–55	10.8 µg/m³	24h	26
2026-07-26	48	45–54	11.7 µg/m³	24h	27
2026-07-25	46	39–55	11.2 µg/m³	19h	26

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