What is the air quality trend in Chicago Heights?

Over the past 8 days, Chicago Heights had an average AQI of 103 based on station measurements. The worst day was 2026-07-17 with AQI 233.

How is Chicago Heights air quality measured?

Air quality in Chicago Heights 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 Chicago Heights, United States

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

Historical PM2.5 and AQI trend from monitoring stations near Chicago Heights, United States.

Current AQI
Moderate Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

168h

PM2.5 Station

168h · 6 stations

Temperature GFS model

28pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-07-21	64	32–98	18.9 µg/m³	23h	216
2026-07-20	98	57–106	34.4 µg/m³	24h	218
2026-07-19	110	52–160	40.4 µg/m³	24h	227
2026-07-18	50	33–87	12.8 µg/m³	24h	228
2026-07-17	233	69–363	179.1 µg/m³	24h	239
2026-07-16	154	52–323	99.4 µg/m³	24h	221
2026-07-15	59	52–168	16.6 µg/m³	24h	230
2026-07-14	59	59–59	15.9 µg/m³	1h	241

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