Bad Air Days in Bryan County, Oklahoma: 2 a Year
2 bad air days a year
Fewer bad air days than most monitored US counties. Ranked 531 of 996 monitored counties, where 1 is worst.
What makes them bad: mostly ozone: summer smog (0% particle days).
The bad-air season here
- J
- F
- M
- A
- M
- J
- J
- A
- S
- O
- N
- D
Most bad days here fall in May and July and August. 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 worst days on file
The worst recent year was 2018, with 3 bad days on 301 monitored days.
| Date | AQI | Main pollutant |
|---|---|---|
| 2018-05-08 | 119 | Ozone |
| 2018-08-24 | 105 | Ozone |
| 2018-07-28 | 101 | Ozone |
| 2017-10-19 | 93 | Ozone |
| 2018-04-24 | 90 | Ozone |
An ordinary day in Bryan
Across 595 monitored days from 2017 to 2018, the air in Bryan County rated Good on 87% of them, more often than the 72% typical of monitored counties, and Moderate on 12%. The median day sat at AQI 38; one day in ten went above 55.
The pollutant setting the AQI on an ordinary day here:
- ozone100%595 days
Bryan County by year
| Year | Days monitored | Good | Moderate | Over 100 | Over 150 | Median AQI | Highest AQI |
|---|---|---|---|---|---|---|---|
| 2018 | 301 | 257 | 41 | 3 | 0 | 38 | 119 |
| 2017 | 294 | 262 | 32 | 0 | 0 | 39 | 93 |
| 2014 | 333 | 293 | 38 | 2 | 0 | 39 | 126 |
| 2013 | 137 | 113 | 22 | 2 | 0 | 35 | 126 |
Nearby counties on file
- 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.