What is the air quality trend in Joliet?

Over the past 8 days, Joliet had an average AQI of 101 based on station measurements. The worst day was 2026-07-17 with AQI 232.

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
Good Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

167h

PM2.5 Station

167h · 7 stations

Temperature GFS model

28pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-07-21	65	32–97	19.3 µg/m³	22h	226
2026-07-20	98	64–106	34.3 µg/m³	24h	230
2026-07-19	110	47–160	40.4 µg/m³	24h	240
2026-07-18	49	26–88	12.8 µg/m³	24h	240
2026-07-17	232	68–361	178.7 µg/m³	24h	252
2026-07-16	149	52–324	97.5 µg/m³	24h	233
2026-07-15	52	45–59	12.8 µg/m³	24h	243
2026-07-14	59	59–59	16.0 µg/m³	1h	253

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