“According to the report, the Pittsburgh metropolitan area experienced 220 days of elevated soot pollution in 2015, more than any city east of the Mississippi. Pittsburgh also experienced 93 days of elevated smog pollution, which ranked third among northeastern cities.
“What look like clear skies can mislead us into thinking our health is not at risk, said Dr. Ned Ketyer, a Pittsburgh pediatrician. Ketyer said that the size of particles emitted from industrial complexes has decreased enormously over the years. But while smaller particles won’t blacken the skies, as seen in some historical photos of Pittsburgh, they will invade the lungs and bloodstream more easily.”