At any given moment, 75% of the air you breathe in a subway car is recycled.
NEW YORK — Many New Yorkers are avoiding the subway, fearful of jostling with strangers in crowded cars. Masks and social distancing are essential, but good air flow is also key to reducing the risk of exposure to the virus.
Continuous air flow through the vents helps limit viral particles from building up inside a car and infecting people as they inhale. Still, the subway’s so-called air exchange rate — or how often recirculated air is completely replaced with fresh air — helps minimize the risk of coronavirus transmission for riders. The recycled air on subway cars is replaced on average at least 18 times an hour, far higher than the recommended exchange rate for offices, which is six to eight times an hour, or classrooms, which is three to four times an hour.
In the simulation without a mask, many more droplets coat the floor around the rider, and aerosols disperse into the air, eventually moving through the ventilation system.
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