Bad Air Days in Pueblo County, Colorado: 3 a Year
3 bad air days a year
About the middle of monitored US counties. Ranked 405 of 996 monitored counties, where 1 is worst.
What makes them bad: a mix of particles and ozone (41% particle days).
Which months to watch
- J
- F
- M
- A
- M
- J
- J
- A
- S
- O
- N
- D
Most bad days here fall in July and May and April. 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 worst days on file
The worst recent year was 2024, with 8 bad days on 366 monitored days.
| Date | AQI | Main pollutant |
|---|---|---|
| 2024-07-24 | 143 | Ozone |
| 2024-07-23 | 140 | Ozone |
| 2021-08-08 | 138 | PM2.5 |
| 2024-07-25 | 122 | Ozone |
| 2022-05-09 | 121 | PM10 |
An ordinary day in Pueblo
Across 2,260 monitored days from 2016 to 2025, the air in Pueblo County rated Good on 83% of them, more often than the 72% typical of monitored counties, and Moderate on 17%. The median day sat at AQI 34; one day in ten went above 58.
The pollutant setting the AQI on an ordinary day here:
- ozone39%871 days
- fine particles (PM2.5)37%832 days
- coarse dust (PM10)25%557 days
Pueblo County by year
| Year | Days monitored | Good | Moderate | Over 100 | Over 150 | Median AQI | Highest AQI |
|---|---|---|---|---|---|---|---|
| 2025* | 365 | 268 | 96 | 1 | 0 | 45 | 101 |
| 2024 | 366 | 249 | 109 | 8 | 0 | 44 | 143 |
| 2023 | 362 | 277 | 84 | 1 | 0 | 43 | 115 |
| 2022 | 349 | 317 | 29 | 3 | 0 | 21 | 121 |
| 2021 | 220 | 203 | 16 | 1 | 0 | 23 | 138 |
| 2020 | 96 | 84 | 12 | 0 | 0 | 22 | 67 |
| 2019 | 126 | 125 | 1 | 0 | 0 | 26 | 68 |
| 2018 | 123 | 108 | 14 | 1 | 0 | 29 | 101 |
| 2017 | 125 | 113 | 10 | 2 | 0 | 26 | 108 |
| 2016 | 128 | 121 | 7 | 0 | 0 | 26 | 64 |
| 2015 | 129 | 120 | 9 | 0 | 0 | 25 | 95 |
| 2014 | 124 | 110 | 13 | 1 | 0 | 28 | 110 |
| 2013 | 127 | 112 | 15 | 0 | 0 | 29 | 92 |
| 2012 | 133 | 116 | 17 | 0 | 0 | 31 | 82 |
| 2011 | 126 | 114 | 12 | 0 | 0 | 27 | 82 |
| 2010 | 142 | 128 | 14 | 0 | 0 | 31 | 70 |
*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.