Bad Air Days in Chippewa County, Michigan: under 1 a Year
under 1 bad air days a year
Rare: among the cleanest-air counties EPA monitors. Ranked 861 of 996 monitored counties, where 1 is worst.
What makes them bad: mostly ozone: summer smog (0% particle days).
Which months to watch
- J
- F
- M
- A
- M
- J
- J
- A
- S
- O
- N
- D
Most bad days here fall in June. Averaged over 2016 to 2025.
Is a purifier worth it 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.
Better or worse than it was
The worst recent year was 2016, with 1 bad day on 299 monitored days.
| Date | AQI | Main pollutant |
|---|---|---|
| 2016-06-19 | 101 | Ozone |
| 2017-06-10 | 87 | Ozone |
| 2016-08-04 | 84 | Ozone |
| 2017-02-24 | 81 | PM2.5 |
| 2016-04-17 | 80 | Ozone |
An ordinary day in Chippewa
Across 935 monitored days from 2016 to 2019, the air in Chippewa County rated Good on 75% of them, close to the 72% typical of monitored counties, and Moderate on 24%. The median day sat at AQI 40; one day in ten went above 55.
The pollutant setting the AQI on an ordinary day here:
- fine particles (PM2.5)71%664 days
- ozone29%271 days
Year by year
| Year | Days monitored | Good | Moderate | Over 100 | Over 150 | Median AQI | Highest AQI |
|---|---|---|---|---|---|---|---|
| 2019 | 58 | 42 | 16 | 0 | 0 | 43 | 66 |
| 2018 | 271 | 167 | 104 | 0 | 0 | 43 | 73 |
| 2017 | 307 | 238 | 69 | 0 | 0 | 39 | 87 |
| 2016 | 299 | 258 | 40 | 1 | 0 | 37 | 101 |
| 2015 | 358 | 224 | 134 | 0 | 0 | 45 | 84 |
| 2014 | 324 | 261 | 63 | 0 | 0 | 37 | 77 |
| 2013 | 284 | 239 | 45 | 0 | 0 | 34 | 84 |
| 2012 | 270 | 198 | 63 | 9 | 0 | 38 | 147 |
| 2011 | 231 | 206 | 25 | 0 | 0 | 33 | 97 |
| 2010 | 186 | 145 | 38 | 3 | 0 | 31 | 118 |
Nearby counties on file
- Wayne County11/yr
- Marquette County9/yr
- Muskegon County9/yr
- Allegan County9/yr
- Berrien County8/yr
- Macomb County7/yr
- Cass County6/yr
- Oakland County6/yr
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.