BART's tweet - "At any given moment, air in a BART train car is ~75% filtered/~25% fresh air -- similar to a @NYCTSubway car. Intake vents outside the BART car draw in fresh air, treat it through HVAC units, then push the mixed, filtered air back into the train via vents in the window frame. "

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BART

@SFBART | 330,824 followers

At any given moment, air in a BART train car is ~75% filtered/~25% fresh air -- similar to a @NYCTSubway car.

Intake vents outside the BART car draw in fresh air, treat it through HVAC units, then push the mixed, filtered air back into the train via vents in the window frame. https://t.co/8QRUrTwThz

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