Bad Air Days in King William County, Virginia
Not enough data
EPA monitors in King William County ran on too few days between 2016 and 2025 to give a fair yearly count (about 8% of days covered). Neighbouring counties below are a better guide.
Is a purifier worth it here?
- 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 |
|---|---|---|
| 2016-06-11 | 20 | PM10 |
| 2016-06-29 | 17 | PM10 |
| 2016-03-07 | 14 | PM10 |
| 2016-06-23 | 14 | PM10 |
| 2016-03-31 | 13 | PM10 |
An ordinary day in King William
Across 29 monitored days from 2016 to 2016, the air in King William County 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 8; one day in ten went above 14.
The pollutant setting the AQI on an ordinary day here:
- coarse dust (PM10)100%29 days
Every recent year on file
| Year | Days monitored | Good | Moderate | Over 100 | Over 150 | Median AQI | Highest AQI |
|---|---|---|---|---|---|---|---|
| 2016 | 29 | 29 | 0 | 0 | 0 | 8 | 20 |
| 2015 | 54 | 54 | 0 | 0 | 0 | 12 | 30 |
| 2014 | 57 | 57 | 0 | 0 | 0 | 10 | 27 |
| 2013 | 60 | 60 | 0 | 0 | 0 | 11 | 25 |
| 2012 | 59 | 59 | 0 | 0 | 0 | 11 | 28 |
| 2011 | 55 | 54 | 1 | 0 | 0 | 12 | 100 |
| 2010 | 57 | 57 | 0 | 0 | 0 | 13 | 42 |
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.