4 in 10 Americans Breathe Unhealthy Air: Report

USA TODAY4 in 10 Americans Breathe Unhealthy Air: ReportPhilly.comWEDNESDAY, April 29, 2015 (HealthDay News) -- More than four in 10 Americans, or about 138.5 million people, are breathing unhealthy air, a new report finds. Despite the fact that many cities have shown improvements in air quality, other metropolitan ...San Diego gets an 'F' for ozone pollution10NewsThe Top Ten Most Polluted Cities in AmericaEcorazziall 239 news articles »