What is the air quality trend in Romeoville?

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

How is Romeoville air quality measured?

Air quality in Romeoville 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 Romeoville, United States

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

Historical PM2.5 and AQI trend from monitoring stations near Romeoville, 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 · 277 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	29–71	13.5 µg/m³	1.1	24h	246
2026-10-19	28	22–41	6.7 µg/m³	3.4	24h	280
2026-10-18	23	18–35	5.4 µg/m³	—	24h	256
2026-10-17	16	13–23	3.9 µg/m³	4.5	24h	280
2026-10-16	19	10–39	4.5 µg/m³	1.1	24h	268
2026-10-15	24	14–41	5.7 µg/m³	1.6	24h	279
2026-10-14	37	18–52	8.9 µg/m³	1.5	21h	278

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