Firefighters across the Northeastern U.S. are tackling a series of wildfires during an abnormally dry fall, impacting air quality from New York City to Philadelphia. The big picture: Much of the region is in drought and the National Weather Service warns dry and windy conditions "could lead to fires over portions of southern New England,

A number of cities will be under red flag warnings Sunday, indicating an increased risk of fire danger, the National Weather Service said.

Firefighters in New York, New Jersey, Massachusetts and Connecticut battled hundreds of blazes during an unseasonably dry fall.