Subway stations located nearest to New York City's waterways tend to have the most hazardous air quality, according to a new study from New York University's Grossman School of Medicine.
“Our findings help explain why some underground subway stations are more polluted than others,” said David Luglio, an NYU doctoral student and the study’s lead author. “Those subway stations closest to rivers clearly must be prioritized during cleaning efforts.”
Overall, air quality in stations closest to rivers was found to have 80-130% higher average concentrations of PM2.5 than even those stations two or three stops away from bodies of water. Potential confounding variables like depth — of particular interest here given stations closest to the water tend to be deeper than average — were found to have no correlation with air quality.
But that’s not possible underwater, meaning harmful particulate matter like iron and carbon are entrapped in the air and build up over time. More particulate matter gets released as trains criss-cross the river and cause the substances to move throughout the tunnel and into stations, the researchers say.
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