What is the air quality trend in Oak Forest?

Over the past 7 days, Oak Forest had an average AQI of 28 based on station measurements. The worst day was 2026-10-20 with AQI 52.

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
Moderate Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

165h

PM2.5 Station

165h · 278 stations

Temperature GFS model

28pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	PM10 avg	Hours	Stations
2026-10-20	52	30–70	13.6 µg/m³	1.1	24h	248
2026-10-19	28	22–41	6.7 µg/m³	3.4	24h	282
2026-10-18	23	18–35	5.4 µg/m³	—	24h	259
2026-10-17	16	13–23	3.9 µg/m³	4.5	24h	282
2026-10-16	19	10–39	4.5 µg/m³	1.1	24h	270
2026-10-15	24	14–41	5.7 µg/m³	1.6	24h	281
2026-10-14	37	18–52	8.9 µg/m³	1.5	21h	280

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