Bad Air Days in Missaukee County, Michigan: 2 a Year

2 bad air days a year

Fewer bad air days than most monitored US counties. Ranked 517 of 996 monitored counties, where 1 is worst.

What makes them bad: mostly ozone: summer smog (32% particle days).

The bad-air season here

Most bad days here fall in June and April and August. Averaged over 2016 to 2025.

What actually helps here

Bad air days are rare here. A standard furnace filter is enough; no purifier needed for outdoor air.
On the odd bad day, check AirNow and keep windows shut.

The record for Missaukee

In 2000 to 2009 this county averaged 10 bad days a year; in 2016 to 2025, 2. The air has improved. The worst recent year was 2023, with 6 bad days on 362 monitored days.

Date	AQI	Main pollutant
2023-06-27	201	PM2.5
2023-06-29	165	PM2.5
2025-07-31	133	PM2.5
2025-08-03	130	PM2.5
2023-06-02	122	Ozone

An ordinary day in Missaukee

Across 3,627 monitored days from 2016 to 2025, the air in Missaukee County rated Good on 77% of them, more often than the 72% typical of monitored counties, and Moderate on 23%. The median day sat at AQI 40; one day in ten went above 57.

The pollutant setting the AQI on an ordinary day here:

ozone54%1,950 days
fine particles (PM2.5)46%1,658 days
nitrogen dioxide1%19 days

Every recent year on file

Year	Days monitored	Good	Moderate	Over 100	Over 150	Median AQI	Highest AQI
2025*	360	313	43	4	0	35	133
2024	365	337	28	0	0	35	84
2023	362	203	153	6	2	48	201
2022	363	228	134	1	0	46	108
2021	355	216	139	0	0	45	90
2020	365	248	116	1	0	41	105
2019	363	306	57	0	0	36	74
2018	365	316	49	0	0	37	97
2017	364	310	53	1	0	37	101
2016	365	302	57	6	0	38	115
2015	361	272	88	1	0	40	101
2014	365	278	87	0	0	41	97
2013	363	306	56	1	0	38	101
2012	363	284	62	17	0	38	147
2011	360	317	41	2	0	36	122
2010	298	252	46	0	0	35	97

*2025 may be a partial year in EPA's file.

Michigan compared

How this is counted

A bad air day is a day the county's daily AQI from EPA AirData went above 100, the level where EPA tells children, older adults and people with asthma or heart disease to cut back outdoors. Monitors do not run every day, so yearly counts are scaled to 365 days. This is the record, not today's air: for that, check AirNow. More on the method in how the county numbers are made, on the AQI 100 line in what counts as a bad air day, and on why a purifier does not touch ozone in smoke vs ozone.