Air pollution inside Philadelphia's subway is much worse than on the streets
A study found that air pollution in Philadelphia's subway, especially at 15th Street-City Hall, is significantly worse than above ground, with black carbon levels ten times higher, necessitating improved monitoring.
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A recent study published in the Journal of Exposure Science & Environmental Epidemiology reveals that air pollution levels in Philadelphia's subway system, particularly at the 15th Street-City Hall station, are significantly worse than those on the streets above. Researchers found that black carbon levels, a major component of fine particulate air pollution, were approximately ten times higher underground. This pollution is primarily attributed to the subway system itself, with potential sources including graphite from brake pads. Additionally, ultrafine particle levels were found to be 1.7 times higher in the subway compared to street level. Factors contributing to this elevated pollution include limited ventilation, high train frequency, and the station's central location. The study emphasizes the need for improved air quality monitoring and pollution reduction strategies in the subway system, such as better ventilation and more frequent cleaning. While the findings highlight serious air quality concerns, they do not suggest that commuters should avoid using the subway, as exposure times are relatively short. For those with health issues, wearing masks can provide protection against particulate pollution. Future research will focus on the health impacts of subway air pollution on lung cells.
- Air pollution in Philadelphia's subway is significantly worse than on the streets.
- Black carbon levels in the subway are about ten times higher than at street level.
- Factors contributing to subway air pollution include limited ventilation and high train frequency.
- The study calls for improved air quality monitoring and pollution reduction measures.
- Commuters are not advised to avoid the subway, but masks can help protect those with health concerns.
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