Bad Air Days in Custer County, Oklahoma: under 1 a Year
under 1 bad air days a year
Rare: among the cleanest-air counties EPA monitors. Ranked 904 of 996 monitored counties, where 1 is worst.
What makes them bad: mostly particles: smoke and dust (100% particle days).
Which months to watch
- J
- F
- M
- A
- M
- J
- J
- A
- S
- O
- N
- D
Most bad days here fall in 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 record for Custer
The worst recent year was 2018, with 1 bad day on 364 monitored days.
| Date | AQI | Main pollutant |
|---|---|---|
| 2018-04-14 | 104 | PM10 |
| 2017-03-06 | 88 | PM10 |
| 2017-03-07 | 71 | PM10 |
| 2018-03-09 | 65 | PM10 |
| 2016-03-23 | 64 | PM10 |
An ordinary day in Custer
Across 1,265 monitored days from 2016 to 2019, the air in Custer County rated Good on 99% of them, more often than the 72% typical of monitored counties, and Moderate on 1%. The median day sat at AQI 16; one day in ten went above 28.
The pollutant setting the AQI on an ordinary day here:
- coarse dust (PM10)100%1,265 days
Year by year
| Year | Days monitored | Good | Moderate | Over 100 | Over 150 | Median AQI | Highest AQI |
|---|---|---|---|---|---|---|---|
| 2019 | 236 | 235 | 1 | 0 | 0 | 14 | 58 |
| 2018 | 364 | 355 | 8 | 1 | 0 | 16 | 104 |
| 2017 | 305 | 302 | 3 | 0 | 0 | 17 | 88 |
| 2016 | 360 | 357 | 3 | 0 | 0 | 15 | 64 |
| 2015 | 135 | 135 | 0 | 0 | 0 | 15 | 38 |
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.