What is the air quality trend in Ann Arbor?

Over the past 7 days, Ann Arbor had an average AQI of 118 based on station measurements. The worst day was 2026-07-17 with AQI 229.

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

167h

PM2.5 Station

167h · 14 stations

Temperature GFS model

28pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-07-21	71	47–88	21.5 µg/m³	24h	16
2026-07-20	76	63–84	23.7 µg/m³	24h	16
2026-07-19	90	76–128	30.5 µg/m³	24h	17
2026-07-18	96	30–188	39.7 µg/m³	24h	16
2026-07-17	229	182–278	175.9 µg/m³	24h	18
2026-07-16	211	141–288	146.4 µg/m³	24h	16
2026-07-15	54	41–90	13.9 µg/m³	23h	16

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