Abstract
Extensive studies correlating carbon monoxide concentrations with traffic density, car capacity and ventilation rates in a two and three-level underground parking garage showed that 500 cubic feet per minute of ventilation must be provided for each parking space in the garage to maintain hygenic standards based upon carbon monoxide and customer acceptance based upon smoke and odor. Provisions should be made to reduce ventilation rates to 350 cubic feet per minute per space during normal load periods. Hygienic standards for peak load operations, fleet type garages and general service type garages are discussed.