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 228.

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

166h

PM2.5 Station

166h · 6 stations

Temperature GFS model

28pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-07-21	63	32–97	18.7 µg/m³	22h	123
2026-07-20	99	57–109	34.6 µg/m³	24h	125
2026-07-19	110	47–161	40.4 µg/m³	24h	132
2026-07-18	51	33–89	13.3 µg/m³	23h	136
2026-07-17	228	69–353	173.5 µg/m³	24h	139
2026-07-16	152	50–327	99.1 µg/m³	24h	128
2026-07-15	53	51–63	13.0 µg/m³	24h	132
2026-07-14	60	60–60	16.4 µg/m³	1h	138

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