Bad Air Days in Canadian County, Oklahoma: 3 a Year
3 bad air days a year
About the middle of monitored US counties. Ranked 336 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 August and July and June. Averaged over 2016 to 2025.
What to buy, and what not to
- Ozone drives many bad days here. Purifiers and filters do not remove ozone, so do not buy one for that. Ozone peaks on hot afternoons: exercise outside in the morning.
The record for Canadian
In 2000 to 2009 this county averaged 11 bad days a year; in 2016 to 2025, 3. The air has improved. The worst recent year was 2024, with 8 bad days on 269 monitored days.
| Date | AQI | Main pollutant |
|---|---|---|
| 2018-07-29 | 150 | Ozone |
| 2023-08-17 | 133 | Ozone |
| 2018-08-09 | 129 | Ozone |
| 2021-08-04 | 126 | Ozone |
| 2018-07-28 | 122 | Ozone |
An ordinary day in Canadian
Across 3,233 monitored days from 2016 to 2025, the air in Canadian County rated Good on 84% of them, more often than the 72% typical of monitored counties, and Moderate on 15%. The median day sat at AQI 39; one day in ten went above 60.
The pollutant setting the AQI on an ordinary day here:
- ozone98%3,168 days
- nitrogen dioxide2%65 days
Canadian County by year
| Year | Days monitored | Good | Moderate | Over 100 | Over 150 | Median AQI | Highest AQI |
|---|---|---|---|---|---|---|---|
| 2025* | 276 | 219 | 55 | 2 | 0 | 43 | 115 |
| 2024 | 269 | 204 | 57 | 8 | 0 | 44 | 119 |
| 2023 | 278 | 195 | 77 | 6 | 0 | 45 | 133 |
| 2022 | 284 | 218 | 63 | 3 | 0 | 43 | 108 |
| 2021 | 333 | 292 | 38 | 3 | 0 | 37 | 126 |
| 2020 | 358 | 332 | 26 | 0 | 0 | 36 | 84 |
| 2019 | 355 | 306 | 48 | 1 | 0 | 37 | 105 |
| 2018 | 360 | 300 | 54 | 6 | 0 | 36 | 150 |
| 2017 | 362 | 307 | 54 | 1 | 0 | 38 | 105 |
| 2016 | 358 | 333 | 25 | 0 | 0 | 36 | 97 |
| 2015 | 358 | 305 | 53 | 0 | 0 | 37 | 90 |
| 2014 | 345 | 289 | 56 | 0 | 0 | 37 | 100 |
| 2013 | 350 | 297 | 49 | 4 | 0 | 38 | 112 |
| 2012 | 359 | 263 | 81 | 15 | 0 | 40 | 122 |
| 2011 | 364 | 257 | 83 | 24 | 0 | 42 | 150 |
| 2010 | 365 | 310 | 51 | 4 | 0 | 37 | 112 |
*2025 may be a partial year in EPA's file.
Oklahoma compared
- Love County10/yr
- Tulsa County6/yr
- Oklahoma County6/yr
- Jefferson County5/yr
- McClain County5/yr
- Ottawa County4/yr
- Carter County4/yr
- Washington County4/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.