Study finds dramatic boost in air quality from electrifying railways

Earth & Climate News -- ScienceDaily · last updated April 16, 2025 – 2:47 PM

Switching from diesel to electric trains dramatically improved the air quality aboard the San Francisco Bay Area’s Caltrain commuter rail line, reducing riders’ exposure to the carcinogen black carbon by an average of 89%, finds a new study. The electrification of the system also significantly reduced the ambient black carbon concentrations within and around the San Francisco station.

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