What is the air quality trend in Elgin?

Over the past 3 days, Elgin had an average AQI of 78 based on station measurements. The worst day was 2026-07-20 with AQI 99.

How is Elgin air quality measured?

Air quality in Elgin 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 Elgin, United States

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

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

Current AQI
Good CAMS model

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

48h

PM2.5 Station

48h · 6 stations

Temperature GFS model

8pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	PM10 avg	Hours	Stations
2026-07-21	63	32–97	18.7 µg/m³	3.2	22h	123
2026-07-20	99	57–109	34.6 µg/m³	8.4	24h	125
2026-07-19	74	44–105	23.8 µg/m³	9.6	2h	69

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