Pennsylvania is one of more than a dozen states suing the EPA for failing to enforce on an important air pollution regulation.
In a federal lawsuitfiled Monday, Pennsylvania and 13 other states, plus the District of Columbia, say the EPA blew by an October 1 deadline to designate which parts of the country are failing to meet recently tightened federal standards for ozone, or ground level smog.
States use those designations to issue regulations on the amount of pollution that power plants, cars and factories can produce within their borders.