Environment

The state of Delaware threaten to sue the U.S. Environmental Protection Agency for allegedly failing to protect its residents from poor air quality, unless it takes action.

Northeast state attorneys general say Midwest states should be subject to the same tough ozone standards.

A tree known as the Jackson Magnolia has stood on the grounds of the White House for nearly 200 years and stood witness to 39 presidencies.

The 13 recommendations are the first step in determining how the state will issue coastal zone conversion permits to allow industrial sites to be repurposed.

The site of some of the state’s newest gas wells lies atop a Washington County hill in Frank Brownlee’s backyard.

One way to learn about climate change is to read about it. Another way is to experience it firsthand.

While the cold snap in the Philadelphia region is sending humans searching for warmth, some animals at local zoos are happy chilling outdoors. Others, not so much.

The penalties stem from incidents at four well sites that affected waterways and vegetation, according to the DEP.

After a coal-fired power plant in Pennsylvania closed, early-life health outcomes improved for babies across the border, in New Jersey.

Much of the tidal marshland in New Jersey’s Barnegat Bay has been destroyed, but the remaining 26,000 acres provide important filtering for the ecosystem.