What is the air quality trend in Eau Claire?

Over the past 8 days, Eau Claire had an average AQI of 109 based on station measurements. The worst day was 2026-07-16 with AQI 275.

How is Eau Claire air quality measured?

Air quality in Eau Claire 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 Eau Claire, United States

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

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

Current AQI
Moderate Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

33h

PM2.5 Station

33h · 1 station

Temperature GFS model

28pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-07-21	53	47–59	13.6 µg/m³	2h	1
2026-07-20	90	33–172	36.9 µg/m³	5h	1
2026-07-19	175	165–183	102.0 µg/m³	5h	1
2026-07-18	65	41–76	19.0 µg/m³	6h	1
2026-07-17	132	75–169	57.1 µg/m³	3h	1
2026-07-16	275	239–316	226.1 µg/m³	4h	1
2026-07-15	39	34–43	9.3 µg/m³	7h	1
2026-07-14	45	45–45	10.8 µg/m³	1h	1

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