A ventilation system for an elevator cab including one or more reversible supply and exhaust fans wherein at least one of the exhaust fans is mounted on the top of the elevator cab, an air-quality monitor affixed to a side wall inside of the elevator cab wherein the air-quality monitor has a user interface for displaying air-quality information to a passenger, and an HVAC system having one or more ducts for delivering at east 150 CFM of ventilation air through the elevator's hoistway, to the elevator cab.