What is the air quality trend in Oak Forest?

Over the past 8 days, Oak Forest had an average AQI of 99 based on station measurements. The worst day was 2026-07-17 with AQI 233.

How is Oak Forest air quality measured?

Air quality in Oak 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 Oak Forest, United States

Name: Oak 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 Oak Forest, United States.

Current AQI
Good Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

168h

PM2.5 Station

168h · 4 stations

Temperature GFS model

28pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-07-22	30	28–32	7.2 µg/m³	2h	140
2026-07-21	62	32–97	18.2 µg/m³	24h	264
2026-07-20	99	71–107	34.6 µg/m³	24h	254
2026-07-19	111	61–160	40.7 µg/m³	24h	264
2026-07-18	50	26–89	12.9 µg/m³	24h	265
2026-07-17	233	69–357	179.3 µg/m³	24h	278
2026-07-16	154	52–329	101.0 µg/m³	24h	258
2026-07-15	57	52–140	14.8 µg/m³	22h	269

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