What is the air quality trend in Joliet?

Over the past 8 days, Joliet had an average AQI of 31 based on station measurements. The worst day was 2026-10-21 with AQI 54.

How is Joliet air quality measured?

Air quality in Joliet 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 Joliet, United States

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

Historical PM2.5 and AQI trend from monitoring stations near Joliet, 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 · 252 stations

Temperature GFS model

28pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	PM10 avg	Hours	Stations
2026-10-21	54	52–56	13.7 µg/m³	9.1	3h	253
2026-10-20	52	17–72	13.6 µg/m³	1.1	24h	222
2026-10-19	28	22–41	6.7 µg/m³	3.4	24h	253
2026-10-18	23	16–35	5.4 µg/m³	—	24h	231
2026-10-17	16	13–23	3.9 µg/m³	4.5	24h	252
2026-10-16	19	11–41	4.6 µg/m³	1.1	24h	242
2026-10-15	24	14–42	5.8 µg/m³	1.6	24h	252
2026-10-14	35	18–52	8.5 µg/m³	1.4	18h	251

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