Air pollution in US subway stations is disturbingly high ...Middle East

Globally, about 168 million people rode metro systems per day in 2017. (Pixabay/)Air pollution in subway systems across the Northeastern United States is unsettlingly high, scientists reported on February 10 in the journal Environmental Health Perspectives. The researchers sampled the air at subway stations across the New York, Boston, Philadelphia, and Washington, D.C. metropolitan areas and found particulate (microscopic particles that float around in the air) concentrations that were generally two to seven times the Environmental Protection Agency’s daily recommended limit. Overall, New York was the worst offender, and the airborne particle levels in one “exceptional” station were higher

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