Loudoun was one of several counties in the region to receive an “F” for its number of high-ozone days, according to the American Lung Association's 2014 “State of the Air” report released in April.
Also receiving “Fs” in the category were Alexandria, Arlington and Fairfax counties, while neighboring Fauquier County received an “A,” Frederick County a “B” and Prince William a “C.”
The most widespread air pollutant, ozone, which can cause wheezing, coughing and asthma attacks, is created by the reaction of sunlight on emissions from vehicles and other sources, according to the association.
“The air in Northern Virginia is certainly cleaner than when we started the report 15 years ago, thanks to the Clean Air Act,” Dennis Alexander, regional executive director for the American Lung Association in Virginia, said in a statement. “However, we still have work to do. Warmer temperatures make dangerous levels of ozone more likely, so we must set strong standards to protect our health from both ozone and the carbon pollution that causes climate change.”
In terms of particle pollution, or soot, Loudoun received a “B,” maintaining the same level as the 2013 report.
The American Lung Association's “State of the Air 2014” can be found at http://www.StateoftheAir.com