Bad Air Days in Jackson County, Colorado
Not enough data
EPA monitors in Jackson County ran on too few days between 2016 and 2025 to give a fair yearly count (about 47% of days covered). Neighbouring counties below are a better guide.
Is a purifier worth it here?
- EPA monitors here ran too few days to give a fair yearly count. Use AirNow for today's air.
The record for Jackson
The worst recent year was 2017, with 1 bad day on 117 monitored days.
| Date | AQI | Main pollutant |
|---|---|---|
| 2017-09-07 | 110 | PM2.5 |
| 2023-04-23 | 108 | Ozone |
| 2024-07-22 | 105 | Ozone |
| 2024-07-23 | 101 | Ozone |
| 2024-08-03 | 101 | Ozone |
The air on a normal day
Across 1,701 monitored days from 2016 to 2025, the air in Jackson County rated Good on 90% of them, more often than the 72% typical of monitored counties, and Moderate on 10%. The median day sat at AQI 28; one day in ten went above 44.
The pollutant setting the AQI on an ordinary day here:
- ozone50%857 days
- fine particles (PM2.5)49%829 days
- coarse dust (PM10)1%13 days
Jackson County by year
| Year | Days monitored | Good | Moderate | Over 100 | Over 150 | Median AQI | Highest AQI |
|---|---|---|---|---|---|---|---|
| 2025* | 89 | 88 | 1 | 0 | 0 | 9 | 56 |
| 2024 | 364 | 304 | 57 | 3 | 0 | 44 | 105 |
| 2023 | 365 | 289 | 75 | 1 | 0 | 45 | 108 |
| 2022 | 236 | 216 | 20 | 0 | 0 | 40 | 71 |
| 2021 | 116 | 109 | 7 | 0 | 0 | 7 | 90 |
| 2020 | 81 | 73 | 8 | 0 | 0 | 7 | 85 |
| 2019 | 102 | 102 | 0 | 0 | 0 | 8 | 34 |
| 2018 | 116 | 113 | 3 | 0 | 0 | 9 | 64 |
| 2017 | 117 | 115 | 1 | 1 | 0 | 7 | 110 |
| 2016 | 115 | 114 | 1 | 0 | 0 | 8 | 53 |
| 2015 | 363 | 345 | 18 | 0 | 0 | 38 | 93 |
| 2014 | 363 | 341 | 22 | 0 | 0 | 40 | 77 |
| 2013 | 363 | 324 | 38 | 1 | 0 | 42 | 112 |
| 2012 | 363 | 329 | 34 | 0 | 0 | 40 | 72 |
| 2011 | 161 | 161 | 0 | 0 | 0 | 30 | 44 |
| 2010 | 111 | 111 | 0 | 0 | 0 | 9 | 47 |
*2025 may be a partial year in EPA's file.
Colorado compared
- Jefferson County28/yr
- Teller Countythin data
- Douglas County20/yr
- Larimer County18/yr
- Boulder County13/yr
- Weld County12/yr
- Arapahoe County12/yr
- Denver County12/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.