Air pollution inside Philly’s subway is much worse than on the streets
The air quality in the City Hall subway station in downtown Philadelphia ... above ground using three types of monitors. We ...
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Air pollution inside Philadelphia's subway is much worse than on the streets, study finds
The air quality in the City Hall subway station in downtown Philadelphia ... above ground using three types of monitors. We took measurements for six hours a day, from about 9 a.m. to 3 p.m ...