What is the air quality trend in Lemont?

Over the past 8 days, Lemont had an average AQI of 31 based on station measurements. The worst day was 2026-10-21 with AQI 55.

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
Moderate Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

166h

PM2.5 Station

166h · 282 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	55	52–57	14.0 µg/m³	7.1	4h	282
2026-10-20	51	25–70	13.3 µg/m³	1.1	24h	247
2026-10-19	28	21–41	6.7 µg/m³	3.4	24h	282
2026-10-18	23	18–35	5.5 µg/m³	—	24h	259
2026-10-17	16	13–23	3.9 µg/m³	4.5	24h	281
2026-10-16	19	11–40	4.5 µg/m³	1.1	24h	269
2026-10-15	24	14–41	5.7 µg/m³	1.6	24h	280
2026-10-14	35	18–52	8.4 µg/m³	1.4	18h	279

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