Air quality in Philadelphia

Current Conditions: Winds are lightly blowing from the southwest today with a cold front approaching from the west. Air quality is good across the Philadelphia area today. A cold front will sweep through the area this evening, causing a change in wind direction from the northwest, promoting good air quality. *** Thursday’s Forecast: Air quality may briefly reach the low-end moderate category in the morning because warm air just above the ground could trap pollutants near the ground. However, sunshine and a fresh northwest wind will cause efficient mixing of the air, and this will create good a