Smoke from the Canadian wildfires​ will be visible in the Philadelphia area, and an air quality alert has been issued for Wednesday in the Delaware Valley.

On Thursday, the region is expected to be at Code Orange levels, when it can be unhealthy for people with respiratory conditions.

With temperatures creeping toward 90 degrees Wednesday and the milky veil of smoke persisting over the region, the Delaware Valley Regional Planning Commission has declared a “code orange” advisory for the Philadelphia region. It is recommending that people with heart, respiratory, and related health issues limit time outdoors.