Bad Air Days in Greenbrier County, West Virginia: 0 a Year
0 bad air days a year
Rare: among the cleanest-air counties EPA monitors. Ranked 993 of 996 monitored counties, where 1 is worst.
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
In 2000 to 2009 this county averaged 13 bad days a year; in 2016 to 2025, 0. The air has improved.
| Date | AQI | Main pollutant |
|---|---|---|
| 2016-04-19 | 100 | Ozone |
| 2023-06-10 | 87 | Ozone |
| 2017-04-10 | 84 | Ozone |
| 2018-04-13 | 84 | Ozone |
| 2019-09-11 | 84 | Ozone |
Most days, not the worst ones
Across 2,354 monitored days from 2016 to 2025, the air in Greenbrier County rated Good on 95% of them, more often than the 72% typical of monitored counties, and Moderate on 5%. The median day sat at AQI 38; one day in ten went above 47.
The pollutant setting the AQI on an ordinary day here:
- ozone100%2,354 days
Every recent year on file
| Year | Days monitored | Good | Moderate | Over 100 | Over 150 | Median AQI | Highest AQI |
|---|---|---|---|---|---|---|---|
| 2025* | 244 | 227 | 17 | 0 | 0 | 37 | 77 |
| 2024 | 243 | 234 | 9 | 0 | 0 | 40 | 64 |
| 2023 | 242 | 227 | 15 | 0 | 0 | 38 | 87 |
| 2022 | 240 | 236 | 4 | 0 | 0 | 34 | 71 |
| 2021 | 231 | 223 | 8 | 0 | 0 | 37 | 64 |
| 2020 | 234 | 232 | 2 | 0 | 0 | 34 | 54 |
| 2019 | 242 | 222 | 20 | 0 | 0 | 42 | 84 |
| 2018 | 232 | 222 | 10 | 0 | 0 | 38 | 84 |
| 2017 | 239 | 227 | 12 | 0 | 0 | 39 | 84 |
| 2016 | 207 | 189 | 18 | 0 | 0 | 39 | 100 |
| 2015 | 210 | 202 | 8 | 0 | 0 | 38 | 71 |
| 2014 | 211 | 185 | 26 | 0 | 0 | 41 | 93 |
| 2013 | 212 | 192 | 20 | 0 | 0 | 41 | 97 |
| 2012 | 206 | 160 | 44 | 2 | 0 | 44 | 140 |
| 2011 | 208 | 151 | 57 | 0 | 0 | 46 | 97 |
| 2010 | 211 | 155 | 53 | 3 | 0 | 44 | 108 |
*2025 may be a partial year in EPA's file.
Elsewhere in West Virginia
- Ohio County1/yr
- Berkeley County1/yr
- Hancock Countyunder 1/yr
- Wood Countyunder 1/yr
- Marshall Countyunder 1/yr
- Kanawha Countyunder 1/yr
- Cabell Countyunder 1/yr
- Brooke Countyunder 1/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.