Bad Air Days in Winchester City, Virginia
Not enough data
EPA monitors in Winchester City ran on too few days between 2016 and 2025 to give a fair yearly count (about 16% of days covered). Neighbouring counties below are a better guide.
What to buy, and what not to
- EPA monitors here ran too few days to give a fair yearly count. Use AirNow for today's air.
Better or worse than it was
| Date | AQI | Main pollutant |
|---|---|---|
| 2016-01-25 | 25 | PM10 |
| 2019-12-23 | 24 | PM10 |
| 2019-02-02 | 23 | PM10 |
| 2016-01-07 | 22 | PM10 |
| 2016-04-30 | 22 | PM10 |
An ordinary day in Winchester City
Across 293 monitored days from 2016 to 2020, the air in Winchester City rated Good on 100% of them, more often than the 72% typical of monitored counties, and Moderate on 0%. The median day sat at AQI 9; one day in ten went above 15.
The pollutant setting the AQI on an ordinary day here:
- coarse dust (PM10)100%293 days
Year by year
| Year | Days monitored | Good | Moderate | Over 100 | Over 150 | Median AQI | Highest AQI |
|---|---|---|---|---|---|---|---|
| 2020 | 58 | 58 | 0 | 0 | 0 | 6 | 18 |
| 2019 | 57 | 57 | 0 | 0 | 0 | 8 | 24 |
| 2018 | 60 | 60 | 0 | 0 | 0 | 8 | 20 |
| 2017 | 59 | 59 | 0 | 0 | 0 | 11 | 19 |
| 2016 | 59 | 59 | 0 | 0 | 0 | 10 | 25 |
| 2015 | 59 | 59 | 0 | 0 | 0 | 11 | 31 |
| 2014 | 61 | 61 | 0 | 0 | 0 | 8 | 18 |
| 2013 | 57 | 57 | 0 | 0 | 0 | 9 | 19 |
| 2012 | 60 | 60 | 0 | 0 | 0 | 14 | 30 |
| 2011 | 60 | 60 | 0 | 0 | 0 | 12 | 32 |
| 2010 | 60 | 60 | 0 | 0 | 0 | 14 | 40 |
Elsewhere in Virginia
- Arlington County3/yr
- Fairfax County3/yr
- Henrico County1/yr
- Loudoun County1/yr
- Frederick County1/yr
- Bristol Citythin data
- Suffolk Cityunder 1/yr
- Alexandria Citythin data
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.