Asserting that the air quality inside schools is often worse than outdoor pollution, leading to various health complaints and loss of productivity, this paper details factors contributing to schools' indoor air quality. These include the design, operation, and maintenance of heating, ventilating, and air conditioning (HVAC) systems; building equipment maintenance and repair; housekeeping practices and equipment; and wind velocity. It includes recommendations on parameters within these areas which can provide optimal air quality. (Contains 15 references.) (EV)