What is the air quality trend in Elgin?

Over the past 8 days, Elgin had an average AQI of 102 based on station measurements. The worst day was 2026-07-17 with AQI 229.

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 Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

166h

PM2.5 Station

166h · 4 stations

Temperature GFS model

28pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-07-21	64	31–97	19.3 µg/m³	20h	121
2026-07-20	99	49–108	34.7 µg/m³	24h	124
2026-07-19	110	42–161	40.5 µg/m³	24h	130
2026-07-18	50	33–89	13.1 µg/m³	23h	135
2026-07-17	229	71–352	174.6 µg/m³	24h	137
2026-07-16	153	51–324	99.5 µg/m³	24h	126
2026-07-15	52	51–59	12.8 µg/m³	24h	131
2026-07-14	61	60–61	16.7 µg/m³	3h	136

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