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Air pollution inside Philadelphia's subway is much worse than on the streets, study findsThe air quality in the City Hall subway station in downtown Philadelphia is much worse than on the sidewalks directly above the station. That is a key finding of our new study published in the ...
Accessible via 15th & Market Sts, City Hall Station and Walnut-Locust Station subway stations. The busiest part of Philadelphia is downtown or Center City, where the old and the modern come together.
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