Air Quality in Philadelphia
Philadelphia has a long history of air pollution. In the early 1900s, the city was known for its smoky skies and noxious fumes. In recent years, however, the city has significantly improved air quality.
There are a number of factors that contribute to air pollution in...
air pollution in philadelphia
american lung association
bike lanes in philadelphia
hazardous air quality
industry in philadelphia
nationalaverage
philadelphia air quality
public transportation in philadelphia
smoke and fire from canada wildfires
traffic congestion in philadelphia
