May 7, 2012

Air: What’s in a grade?

Although Maricopa County was assigned a grade of “F” for ozone pollution and a grade of “C” for 24-hour particulate pollution in the American Lung Association’s recently released 2012 State of the Air Report, air quality professionals contend that the simple letter grade doesn’t tell the entire story of the Valley’s air, and that progress has been made during recent years in reducing[...]