Study Reveals Alarming Air Pollution in Philly’s City Hall Subway Station

A recent study published in the Journal of Exposure Science & Environmental Epidemiology has uncovered alarming levels of air Pollution in Philadelphia’s City Hall subway station. Researchers found that air quality inside the 15th Street-City Hall station is significantly worse than on the sidewalks above. Specifically, the concentration of black carbon—commonly known as soot—is about ten times higher underground. Black carbon, produced from incomplete combustion of fossil fuels, is linked to health issues like asthma, heart attacks, and lung cancer.

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The study suggests the subway system itself generates this Pollution, possibly from graphite used in train brake pads. Ultrafine particles, measuring 0.1 microns or smaller, were also found to be 1.7 times more abundant in the station. These tiny particles can penetrate deep into the lungs, posing additional health risks.

Several factors contribute to the poor air quality, including limited ventilation, frequent train operations, high passenger volumes, and the station’s central location in the city. While previous studies have examined subway air Pollution in cities like New York and Boston, this research measured a broader range of particle types and sizes, highlighting a more complex Pollution issue.

The findings underscore the need for Philadelphia to monitor and improve air quality in its subway system. Potential solutions include enhancing ventilation, installing platform screen doors, and increasing cleaning efforts to reduce dust accumulation. Despite the concerning data, researchers do not advise commuters to avoid the subway. They note that exposure times are short and Pollution levels can vary. For those with health concerns, wearing N95 or surgical masks can offer significant protection, and subway workers might benefit from using air purifiers.

Looking ahead, the researchers plan to expose lung cells in the lab to particles collected from the station to assess oxidative stress, which contributes to chronic respiratory diseases. By identifying the harmful components, they hope to inform strategies that mitigate health risks associated with subway air Pollution.

Reference: Karim, A.S., Malone, M., Bruno, A. et al. Assessment of air quality in the Philadelphia, Pennsylvania subway. J Expo Sci Environ Epidemiol (2024). https://doi.org/10.1038/s41370-024-00711-9

Article information adapted from ‘Air pollution inside Philly’s subway is much worse than on the streets by Kabindra Shakya at The Conversation’. This article is provided under a Creative Commons license.

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