What is the air quality trend in Lemont?

Over the past 3 days, Lemont had an average AQI of 63 based on station measurements. The worst day was 2026-07-20 with AQI 98.

How is Lemont air quality measured?

Air quality in Lemont 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 Lemont, United States

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

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

Current AQI
Good Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

48h

PM2.5 Station

48h · 5 stations

Temperature GFS model

8pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	PM10 avg	Hours	Stations
2026-07-22	30	27–32	7.0 µg/m³	—	2h	140
2026-07-21	62	32–97	18.3 µg/m³	11.6	24h	264
2026-07-20	98	61–107	34.1 µg/m³	15.1	22h	251

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