A new study has found that New York subway riders are breathing in “exceptionally high” levels of hazardous air. The subway system accommodates 5.5 million commuters every day and some of them are being exposed to more pollution than others. ‘Exceptionally high’ pollution on New York subwayThe study, conducted by researchers at New York University and published in the PLOS One journal, studied 3.1 million workers across four boroughs of New York City: Manhattan, Brooklyn, Queens and The Bronx. They analyzed the levels of a dangerous fine-particle air pollution called PM2.5 on platforms and ins…