Bad Air Days in Washington County, Oklahoma: 4 a Year
4 bad air days a year
About the middle of monitored US counties. Ranked 305 of 996 monitored counties, where 1 is worst.
What makes them bad: mostly particles: smoke and dust (60% 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 and March and August. Averaged over 2016 to 2025.
Is a purifier worth it 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 Washington
The worst recent year was 2024, with 8 bad days on 318 monitored days.
| Date | AQI | Main pollutant |
|---|---|---|
| 2025-03-14 | 168 | PM2.5 |
| 2024-03-28 | 156 | PM2.5 |
| 2021-08-02 | 139 | PM2.5 |
| 2021-04-01 | 129 | PM2.5 |
| 2024-07-11 | 119 | Ozone |
Most days, not the worst ones
Across 1,998 monitored days from 2016 to 2025, the air in Washington County rated Good on 61% of them, less often than the 72% typical of monitored counties, and Moderate on 38%. The median day sat at AQI 46; one day in ten went above 64.
The pollutant setting the AQI on an ordinary day here:
- fine particles (PM2.5)51%1,009 days
- ozone49%989 days
Year by year
| Year | Days monitored | Good | Moderate | Over 100 | Over 150 | Median AQI | Highest AQI |
|---|---|---|---|---|---|---|---|
| 2025* | 344 | 234 | 108 | 2 | 1 | 44 | 168 |
| 2024 | 318 | 182 | 128 | 8 | 1 | 47 | 156 |
| 2021 | 345 | 168 | 170 | 7 | 0 | 51 | 139 |
| 2020 | 344 | 232 | 111 | 1 | 0 | 43 | 101 |
| 2018 | 8 | 4 | 4 | 0 | 0 | 53 | 65 |
| 2017 | 365 | 211 | 152 | 2 | 0 | 47 | 108 |
| 2016 | 274 | 179 | 95 | 0 | 0 | 45 | 100 |
*2025 may be a partial year in EPA's file.
Elsewhere in Oklahoma
- Love County10/yr
- Tulsa County6/yr
- Oklahoma County6/yr
- Jefferson County5/yr
- McClain County5/yr
- Ottawa County4/yr
- Carter County4/yr
- Cleveland County3/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.