Though Philadelphia health officials are hoping the haze will lift Friday, it "definitely looks like it's going to be around for at least a little while," according to Joe DeSilva, a meteorologist with the National Weather Service in Mount Holly.

"Through about Friday night, smoke's still going to be around," he said. "It may not be at the surface, but definitely aloft and in the sky, you'll still be seeing the hazy skies through at least Friday night and probably into parts of Saturday."

The smoke may lessen Friday afternoon, when northwest winds are forecast to hit the region, DeSilva said. As the winds shift "more southerly" that evening, however, the reprieve is likely to end.

While the Code Red alert is in effect, people should limit prolonged outdoor activities, take breaks and consider wearing an N-95 or KN-95 mask. Sensitive groups — such as children, older adults and those with asthma — should take even greater precautions. The safest time for them to venture outdoors is during the early morning and late night hours, DeSilva said.

Follow Kristin & PhillyVoice on Twitter: @kristin_hunt | @thePhillyVoice
Like us on Facebook: PhillyVoice
Have a news tip? Let us know.