Weather

City departments in Philadelphia are urged to allow employees who can work indoors to do so. Public pools will also be closed for the day.

Scientists say worsening heat waves have a clear link to climate change. This year, a seasonal El Niño pattern will also be adding fuel to the fire.

Wildfires continue to rage across Canada, with hundreds burning and more than half out of control.

The number of delays and cancellations at the Philadelphia International Airport are continuing to fluctuate Tuesday after weather disruptions began Monday.

A severe thunderstorm alert has been issued for the threat of severe storms this monday afternoon, lasting well into the evening.

The storm is moving at 21 mph, with maximum wind speeds of 40 mph, according to the National Hurricane Center.

Residents and businesses in the state are being asked to reduce their nonessential water use by 5% to 10%.

At 11:32 a.m., severe thunderstorms capable of producing both tornadoes and extensive straight line wind damage were located over West Chester, moving east at 40 mph.

During periods of high pollution, people can check area-specific AQIs, updated hourly, at airnow.gov.

The smoke density is constantly changing. Here are some of the best ways to track it.

"Red is the color of alert, of stop signs. Purple is the next color in the spectrum, from yellow, to orange, to red." - Information designer Giorgia Lupi, partner at Pentagram

From particulate matter to the AQI, here's what you need to know to protect yourself as the smoky haze settles over much of the East Coast.

Across the eastern U.S., officials warned residents to stay inside and limit or avoid outdoor activities again Thursday.

PECO recommends customers turn off unnecessary lighting, keep curtains closed, and clean their A/C air filters once a month.

Smoke from Canadian wildfires is pouring into the U.S. East Coast and Midwest and covering the capitals of both nations in an unhealthy haze.