An air cleaner is adapted to be mounted inside of a cabin of a mass transit vehicle to remove or disinfect pathogens in the air. The air cleaner includes a housing, an air filter, a grill, and optionally a disinfector. The housing is formed to define an air chamber, an inlet into the air chamber, and an outlet out of the air chamber. A fan draws air through the air chamber during use of the air cleaner. The air filter is received in the air chamber and the grill covers the air filter to secure the air filter between the grill and the housing and allow air to flow through the grill and filter into the air chamber.