Breath of fresher air


  • Michael Carlowicz


In its 1996 annual report on air quality trends, the U.S. Environmental Protection Agency (EPA) reported that, over the past 25 years, major air pollutants in the United States have decreased by almost 30%. Air quality has improved for all six of the “criteria pollutants” monitored by EPA, including carbon monoxide, lead, nitrogen dioxide, ground-level ozone (smog), particulate matter, and sulfur dioxide. The agency notes that over the same period, the gross domestic product of the nation has grown by 100%.