Keweenaw, Michigan Air Quality

Keweenaw County, Michigan (MI)

→ Stableover 10 years

Air Quality Grade

77/100

Current Median AQI

Good

5-Year Avg AQI

10-Year Change

Worse

Unhealthy Days/yr

5-year average

PM2.5

Primary Pollutant

Fine Particulate Matter (PM2.5)

10-Year AQI Trend

The solid line shows the median AQI each year. The dashed line shows the 90th percentile (worst 10% of days).

Air Quality Day Breakdown

Number of days per year in each EPA AQI category. Green = Good (AQI 0-50), Yellow = Moderate (51-100), Orange = Unhealthy for Sensitive Groups (101-150), Red = Unhealthy or worse (151+).

Year-by-Year Data

Year	Median AQI	90th Pct	Max AQI	Good Days	Moderate	Unhealthy+	Pollutant
2023	16	52	141	105	12	2	PM2.5
2022	12	32	58	119	3	0	PM2.5
2021	14	41	67	109	8	0	PM2.5
2020	13	32	124	116	0	1	PM2.5
2019	12	28	73	114	3	0	PM2.5
2018	12	37	66	108	6	0	PM2.5
2017	13	36	64	116	5	0	PM2.5
2016	12	33	55	118	2	0	PM2.5
2015	17	38	63	111	7	0	PM2.5
2014	15	49	65	107	8	0	PM2.5

What This Means for Keweenaw County Residents

Keweenaw, Michigan has received an Air Quality Grade of B (77/100) based on a decade of EPA monitoring data. The current median AQI of 16 falls in the "Good" range.

The primary pollutant affecting this area is Fine Particulate Matter (PM2.5). Over the past 5 years, this area has averaged 1 unhealthy air quality days per year — days when sensitive groups (children, elderly, those with respiratory conditions) should limit outdoor activity.