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Eight-hour ozone exceedences (2010)

Dates and locations in Virginia where air quality monitors recorded ozone concentrations greater than 75 parts per billion, the health-based air quality standard measured over eight hours. The standard was changed in 2008 and the information in this chart reflects number of exceedances under the new standard. The "ND" indicates that no monitor was present.

Numbers indicate ozone concentration in parts per billion. All information is unofficial until quality-assured by the DEQ Office of Air Monitoring.

Richmond Area

  • Charles City County
    • July 6, 2010: 82 PPB
    • July 7, 2010: 78 PPB
    • July 15, 2010: 84 PPB
  • Chesterfield County
    • July 6, 2010: 96 PPB
    • July 7, 2010: 81 PPB
    • August 30, 2010: 88 PPB
    • August 31, 2010: 98 PPB
  • Hanover County
    • July 4, 2010: 87 PPB
    • July 5, 2010: 78 PPB
    • July 7, 2010: 78 PPB
    • August 9, 2010: 78 PPB
  • Henrico County
    • July 5, 2010: 81 PPB
    • July 6, 2010: 76 PPB
    • July 7, 2010: 79 PPB
    • July 15, 2010: 84 PPB
    • August 31, 2010: 76 PPB

Hampton Roads

  • Hampton
    • July 6, 2010: 86 PPB
    • July 7, 2010: 91 PPB
    • August 11, 2010: 97 PPB
    • August 31, 2010: 78 PPB
  • Suffolk (Holland)
    • July 6, 2010: 84 PPB
    • July 7, 2010: 83 PPB
    • August 31, 2010: 85 PPB
  • Suffolk (Tidewater Community College)
    • June 23, 2010: 80 PPB
    • July 6, 2010: 90 PPB
    • July 7, 2010: 87 PPB

Roanoke Area

  • Roanoke County
    • July 8, 2010: 76 PPB

Valley Area

  • Frederick County
    • July 8, 2010: 89 PPB
  • Page County
    • n/a
  • Rockbridge County
    • n/a
  • Rockingham County
    • July 7, 2010: 79 PPB
  • Shenandoah National Park
    • July 7, 2010: 81 PPB
    • July 8, 2010: 77 PPB
    • October 11, 2010: 76 PPB

Northern Virginia

  • Alexandria
    • May 27, 2010: 78 PPB
    • July 7, 2010: 92 PPB
    • August 10, 2010: 81 PPB
    • August 11, 2010: 82 PPB
    • August 17, 2010: 85 PPB
    • August 19, 2010: 77 PPB
    • August 29, 2010: 78 PPB
    • August 30, 2010: 81 PPB
    • August 31, 2010: 87 PPB
  • Arlington County
    • May 27, 2010: 83 PPB
    • June 22, 2010: 79 PPB
    • July 4, 2010: 78 PPB
    • July 6, 2010: 76 PPB
    • July 7, 2010: 92 PPB
    • July 15, 2010: 78 PPB
    • August 10, 2010: 88 PPB
    • August 11, 2010: 85 PPB
    • August 17, 2010: 89 PPB
    • August 29, 2010: 76 PPB
    • August 30, 2010: 85 PPB
    • August 31, 2010: 97 PPB
  • Caroline County
    • May 27, 2010: 80 PPB
    • July 7, 2010: 83 PPB
    • August 30, 2010: 77 PPB
  • Fairfax County (Franconia)
    • May 27, 2010: 88 PPB
    • June 18, 2010: 83 PPB
    • July 4, 2010: 76 PPB
    • July 6, 2010: 78 PPB
    • July 7, 2010: 95 PPB
    • August 10, 2010: 82 PPB
    • August 11, 2010: 89 PPB
    • August 17, 2010: 89 PPB
    • August 19, 2010: 78 PPB
    • August 30, 2010: 91 PPB
    • August 31, 2010: 86 PPB
  • Fairfax County (Mount Vernon)
    • July 6, 2010: 77 PPB
    • July 7, 2010: 91 PPB
  • Fauquier County
    • n/a
  • Loudoun County
    • July 7, 2010: 84 PPB
    • July 8, 2010: 92 PPB
    • August 30, 2010: 83 PPB
    • August 31, 2010: 76 PPB
  • Prince William County
    • July 8, 2010: 93 PPB
    • August 30, 2010: 79 PPB
  • Stafford County
    • May 27, 2010: 80 PPB
    • July 7, 2010: 88 PPB
    • August 17, 2010: 78 PPB
    • August 30, 2010: 86 PPB

Charlottesville Area

  • Albemarle County
    • July 7, 2010: 78 PPB
    • July 8, 2010: 78 PPB
    • August 31, 2010: 79 PPB

Southwestern Virginia

  • Wythe County  
    • n/a