WASHINGTON (AP) -- The Obama administration is tightening limits on the smog-forming pollution that's linked to asthma and respiratory illness - setting a new national ozone standard of 70 parts per billion....
MATTHEW DALY, Associated Press: Health
Thu, 10/01/2015 - 9:34am
WASHINGTON (AP) -- The Obama administration is tightening limits on the smog-forming pollution that's linked to asthma and respiratory illness - setting a new national ozone standard of 70 parts per billion....