Abstract
Distribution of air temperature, air ventilation, and concentration of airborne dust were measured in the underground passage (Shinjuku Metropromenade) at several times in summer, autumn, and winter seasons; and Biometeorological analysis were conducted on the basis of data obtained.
In summer, lower airborne dust concentration was found in the cool air-conditioned area than in hot non-air-conditioned area ; and airborne dust in the air of subway station contained more iron component and lesser lead component than that in the air of out-door ground surface.
In winter, even though the ventilation equipment was not being operated, ventilation frequency was about 10 times/hour in the underground passage. This ventilatory effect was stronger than that of natural ventilation developed by air temperature difference between underground passage and ground surface. Therefore, the dust concentration in the underground passage showed lower level in winter.
