Wildfire smoke is headed for Philly. Here's how to stay safe

Wildfire smoke is expected to reach the Philadelphia area starting Wednesday night and continue until at least Friday, according to the National Weather Service. As air quality declines, specific safety precautions are advised for residents. Simultaneously, smoke is arriving in the Twin Cities and central Minnesota. The duration and intensity of the smoky conditions in these Minnesota regions will be determined by prevailing wind patterns and how long the smoke remains in the area.