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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 ...
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NYC subway riders face significantly high air pollution, posing health risks: study
Some subway stations and train lines were found to ... She noted that standard air pollution measurements, such as the World Health Organization (WHO), are based on 24-hour monitoring, while ...