Bad Air Days in Campbell County, Wyoming: 5 a Year
5 bad air days a year
More bad air days than three quarters of monitored counties. Ranked 193 of 996 monitored counties, where 1 is worst.
What makes them bad: mostly particles: smoke and dust (76% particle days).
When the bad days come in Campbell
- J
- F
- M
- A
- M
- J
- J
- A
- S
- O
- N
- D
Most bad days here fall in September and July and August. Averaged over 2016 to 2025.
Is a purifier worth it here?
- Particles (wildfire smoke, dust) cause enough bad days here to matter. A HEPA purifier sized to your bedroom removes them; run it with windows shut on bad days.
- Upgrade the furnace or AC filter to MERV 13 so the whole house is filtered, not just one room.
The record for Campbell
In 2000 to 2009 this county averaged 8 bad days a year; in 2016 to 2025, 5. The air has improved. The worst recent year was 2021, with 16 bad days on 365 monitored days.
| Date | AQI | Main pollutant |
|---|---|---|
| 2022-04-06 | 584 | PM10 |
| 2023-09-05 | 177 | PM2.5 |
| 2017-09-03 | 169 | PM2.5 |
| 2018-08-17 | 169 | PM10 |
| 2018-05-17 | 167 | PM10 |
Most days, not the worst ones
Across 3,653 monitored days from 2016 to 2025, the air in Campbell County rated Good on 67% of them, less often than the 72% typical of monitored counties, and Moderate on 31%. The median day sat at AQI 44; one day in ten went above 68.
The pollutant setting the AQI on an ordinary day here:
- ozone55%2,018 days
- coarse dust (PM10)36%1,326 days
- fine particles (PM2.5)8%306 days
Year by year
| Year | Days monitored | Good | Moderate | Over 100 | Over 150 | Median AQI | Highest AQI |
|---|---|---|---|---|---|---|---|
| 2025* | 365 | 271 | 92 | 2 | 1 | 44 | 156 |
| 2024 | 366 | 232 | 129 | 5 | 2 | 44 | 161 |
| 2023 | 365 | 245 | 113 | 7 | 1 | 45 | 177 |
| 2022 | 365 | 210 | 146 | 9 | 2 | 48 | 584 |
| 2021 | 365 | 218 | 131 | 16 | 0 | 44 | 143 |
| 2020 | 366 | 247 | 116 | 3 | 0 | 44 | 124 |
| 2019 | 365 | 301 | 63 | 1 | 0 | 41 | 111 |
| 2018 | 365 | 256 | 105 | 4 | 2 | 43 | 169 |
| 2017 | 365 | 229 | 129 | 7 | 3 | 45 | 169 |
| 2016 | 366 | 252 | 113 | 1 | 0 | 44 | 141 |
| 2015 | 365 | 241 | 121 | 3 | 1 | 46 | 198 |
| 2014 | 365 | 253 | 111 | 1 | 0 | 44 | 109 |
| 2013 | 365 | 205 | 159 | 1 | 0 | 48 | 106 |
| 2012 | 366 | 128 | 223 | 15 | 2 | 57 | 156 |
| 2011 | 365 | 197 | 163 | 5 | 1 | 49 | 169 |
| 2010 | 365 | 227 | 137 | 1 | 0 | 46 | 124 |
*2025 may be a partial year in EPA's file.
Elsewhere in Wyoming
- Platte County9/yr
- Sweetwater County7/yr
- Albany County6/yr
- Sublette County5/yr
- Sheridan County3/yr
- Laramie County3/yr
- Teton County3/yr
- Fremont County2/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.