What is the air quality trend in Ann Arbor?

Over the past 7 days, Ann Arbor had an average AQI of 116 based on station measurements. The worst day was 2026-07-17 with AQI 226.

How is Ann Arbor air quality measured?

Air quality in Ann Arbor 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 Ann Arbor, United States

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

Historical PM2.5 and AQI trend from monitoring stations near Ann Arbor, 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 · 16 stations

Temperature GFS model

28pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-07-21	72	56–87	22.2 µg/m³	22h	17
2026-07-20	75	51–87	23.6 µg/m³	24h	17
2026-07-19	88	73–115	29.7 µg/m³	24h	17
2026-07-18	94	41–190	37.8 µg/m³	24h	17
2026-07-17	226	172–281	171.1 µg/m³	24h	18
2026-07-16	207	142–278	141.9 µg/m³	24h	17
2026-07-15	54	43–86	14.0 µg/m³	24h	17

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