Eight-hour ozone exceedances (2018)

The list below displays the dates and locations in Virginia where air quality monitors recorded ozone concentrations greater than 70 parts per billion (ppb), the health-based air quality standard measured over eight hours. A table displaying the number of ozone exceedances at each location from 1990-present can be viewed on the Air Monitoring Publications page.

Numbers indicate ozone concentration in parts per billion (ppb). All information is unofficial until quality-assured by the DEQ Office of Air Monitoring. The Clean Air Status and Trends Network (CASTNET) sites are maintained by the U.S. EPA and the data is unofficial until quality-assured by the U.S. EPA.

Northern Virginia

  • Arlington County
    • June 30: 71 ppb
    • July 3: 72 ppb
    • July 9: 77 ppb
  • Fairfax County (Franconia)
    • May 24: 71 ppb
  • Loudoun County
    • No exceedances to date
  • Prince William County
    • No exceedances to date

Richmond Area

  • Charles City County
    • June 18: 72 ppb
  • Chesterfield County
    • No exceedances to date
  • Hanover County
    • No exceedances to date
  • Henrico County
    • June 30: 84 ppb

Hampton Roads Area

  • Hampton
    • No exceedances to date
  • Suffolk (Holland)
    • No exceedances to date
  • Suffolk (Tidewater Community College)
    • No exceedances to date

Roanoke Area

  • Roanoke County
    • No exceedances to date

Valley Area

  • Frederick County
    • No exceedances to date
  • Rockbridge County
    • No exceedances to date
  • Rockingham County
    • No exceedances to date
  • Shenandoah National Park
    • No exceedances to date

Fredericksburg Area

  • Caroline County
    • No exceedances to date
  • Stafford County
    • July 12: 74 ppb

Charlottesville Area

  • Albemarle County
    • No exceedances to date

Fauquier County

  • Fauquier County
    • No exceedances to date

Southwestern Virginia

  • Wythe County  
    • No exceedances to date 

Giles County (CASTNET)

  • Giles County
    • No exceedances to date

Prince Edward County (CASTNET)

  • Prince Edward County
    • No exceedances to date

 

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Virginia Department of
Environmental Quality
P.O. Box 1105
Richmond, VA 23218
(804) 698-4000


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