Poor air quality caused by ozone and other sources prompted the warnings across six states on Thursday and Friday.

According to the National Park Service, fireworks on the National Mall are set to begin at 9 p.m. local time on July 4. The ...

Road closures, reduced county services and modified transit schedules will be in effect tomorrow (Friday) in observance of ...

Here are six volunteers who make a difference at National Parks and other federal lands, from an 8-year-old who does the ...