Weather

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.

To protect yourself and your family, avoid going outside if possible and close windows and doors.

Smoke is being funneled down from raging wildfires in Quebec due to “a unique weather pattern,” the Health Department said.

The National Weather Service said air quality has "plummeted" across the Northeast. A disaster preparedness expert says people should take the warnings seriously.

Last week, U.S. officials as far south as Maryland, Virginia, and Pennsylvania reported being impacted by the wildfires.

Be careful when discarding cigarette butts, keep vehicles off of dry grass, and consider skipping the campfire.

Philadelphia, Wilmington, Reading, and Mount Pocono recorded rainfall between .09 and .75 inches for the month.