Study on contamination control of airborne particle from air conditioning systems in Japanese buildings.

Field studies were carried out on air contamination by dust particles from air conditioning systems in four buildings in Tokyo area. We tried to investigate contamination of airborne particle and surface contamination by sedimentary dust in air duct, and considered a matter in all its aspects that caused indoor air pollution.

1. Time variations of airborne particle concentrations at supply outlet were influenced by the operation of air conditioning system.

2. Specially, maximum concentration was showed at the first one of the day. 3. The test on the opening of the service port door showed most significant increase of the particulate generation.