Bad Air Days in Dodge County, Wisconsin: 4 a Year
4 bad air days a year
About the middle of monitored US counties. Ranked 311 of 996 monitored counties, where 1 is worst.
What makes them bad: a mix of particles and ozone (47% particle days).
When the bad days come in Dodge
- J
- F
- M
- A
- M
- J
- J
- A
- S
- O
- N
- D
Most bad days here fall in June and May and July. Averaged over 2016 to 2025.
What to buy, and what not to
- 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 Dodge
In 2000 to 2009 this county averaged 11 bad days a year; in 2016 to 2025, 4. The air has improved. The worst recent year was 2023, with 19 bad days on 365 monitored days.
| Date | AQI | Main pollutant |
|---|---|---|
| 2023-06-27 | 210 | PM2.5 |
| 2023-06-28 | 209 | PM2.5 |
| 2023-04-28 | 203 | Ozone |
| 2023-06-29 | 178 | PM2.5 |
| 2025-07-31 | 171 | PM2.5 |
Most days, not the worst ones
Across 3,653 monitored days from 2016 to 2025, the air in Dodge County rated Good on 71% of them, close to the 72% typical of monitored counties, and Moderate on 28%. The median day sat at AQI 42; one day in ten went above 63.
The pollutant setting the AQI on an ordinary day here:
- ozone57%2,076 days
- fine particles (PM2.5)43%1,574 days
Year by year
| Year | Days monitored | Good | Moderate | Over 100 | Over 150 | Median AQI | Highest AQI |
|---|---|---|---|---|---|---|---|
| 2025* | 365 | 264 | 94 | 7 | 1 | 40 | 171 |
| 2024 | 366 | 297 | 69 | 0 | 0 | 38 | 84 |
| 2023 | 365 | 213 | 133 | 19 | 5 | 46 | 210 |
| 2022 | 365 | 266 | 99 | 0 | 0 | 42 | 93 |
| 2021 | 365 | 216 | 149 | 0 | 0 | 46 | 99 |
| 2020 | 366 | 247 | 117 | 2 | 0 | 42 | 136 |
| 2019 | 365 | 257 | 107 | 1 | 0 | 42 | 122 |
| 2018 | 365 | 250 | 112 | 3 | 0 | 44 | 133 |
| 2017 | 365 | 292 | 72 | 1 | 0 | 39 | 122 |
| 2016 | 366 | 280 | 83 | 3 | 0 | 38 | 148 |
| 2015 | 365 | 273 | 91 | 1 | 0 | 41 | 101 |
| 2014 | 365 | 236 | 124 | 5 | 0 | 43 | 108 |
| 2013 | 365 | 209 | 154 | 2 | 1 | 47 | 214 |
| 2012 | 366 | 193 | 160 | 13 | 1 | 49 | 179 |
| 2011 | 365 | 196 | 163 | 6 | 0 | 47 | 115 |
| 2010 | 351 | 207 | 141 | 3 | 0 | 46 | 125 |
*2025 may be a partial year in EPA's file.
Elsewhere in Wisconsin
- Sheboygan County16/yr
- Racine County15/yr
- Kenosha County12/yr
- Ozaukee County9/yr
- Milwaukee County8/yr
- Manitowoc County7/yr
- Door County7/yr
- Walworth 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.