The air quality index measures PM2.5, less than 2.5 microns particles, to determine the intensity of air pollution in cities.

The new bridge set to replace Maryland's Francis Scott Key Bridge will stand 45 feet taller, allowing larger ships to pass.

Groups seeking to protect birthright citizenship in the U.S. will get to make its case in front of a federal judge Wednesday, but not before supporters rally ...

Law enforcement is searching for a shooter after one person was killed and another five were wounded at a warehouse in New ...