"After successful pilot, denser filters will be added throughout BART’s fleet of train cars"

"Air filtration has an important role in preventing transmission of the coronavirus, along with vigilant..." (Bay Area Rapid Transit, 2021)

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References:

Bay Area Rapid Transit (2021, January 27). After successful pilot, denser filters will be added throughout BART’s fleet of train cars. Retrieved from Mass Transit: https://www.masstransitmag.com/rail/vehicles/hvac/press-release/21207657/bay-area-rapid-transit-bart-after-successful-pilot-denser-filters-will-be-added-throughout-barts-fleet-of-train-cars