jan 1, 2007 - 46% of all Americans resided in counties with unhealthy levels of either ozone or particle pollution, according to the American Lung Association (ALA)
Description:
46% of all Americans resided in counties with unhealthy levels of either ozone or particle pollution, according to the American Lung Association (ALA)Added to timeline:
Date:
jan 1, 2007
Now
~ 18 years ago