An analysis by WHYY News shows the increased traffic could raise Philly’s transportation sector carbon emissions by around 4%.

The U.S. Senate is moving forward with an effort to block California's nation-leading standards for vehicle emissions.

Who runs the Senate? The democratically elected Majority Leader, Sen. John Thune? Or leftover partisan Harry Reid-appointee, ...

Former Tonight Show host and avid car collector Jay Leno thinks so. He’s thrown his support behind a bill in the state ...

State and local authority over air quality will be jeopardized if Congress revokes California’s auto emissions limits, ...

Before the EPA, the US environment was not federally protected. Vintage photos show Los Angeles before regulations limited ...

The Children's Hospital of Philadelphia lot would be located in a working-class, largely residential neighborhood, where ...