Lancaster PA 10th-Smoggiest Midsized Metropolitan Area In The United States

Sign No. 270 ā€“ no traffic allowed due to smog

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Despite continuing air-quality improvements, Lancaster was the 10th-smoggiest midsize metropolitan area in the United States during 2010, according to a report.

Using data from government air-quality monitors, the Philadelphia-based group PennEnvironment also found the Lancaster area tied with Pittsburgh for the second-most number of unhealthy smog days among all metropolitan areas in Pennsylvania.

Philadelphia had the worst smog in the state, according to the report, “Danger in the Air: Unhealthy Air Days in 2010 and 2011.”

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