In WEIZHEN LU* and ANDREW T. HOWARTH*, 1996 reported that Since the energy crisis in 1970, a significant number of buildings have become more airtight in modern industrial countries for the purpose of energy conservation. Many of these buildings are also divided into multi-zone areas. The air exchange between indoors and outdoors is mainly through the ventilation system. In such situations, the indoor air movement and pollutant particle deposition and migration are largely influenced by particle properties, ventilation conditions, room dimensions, sizes and locations of interzonal openings, turbulence intensity, etc.
airtight (m-w.com), adj.:
1 : impermeable to air or nearly so
2 a : having no noticeable weakness, flaw, or loophole
2 b : permitting no opportunity for an opponent to score
The indoor aerosol particles are a combination of indoor sources (e.g. cigarette smoke, building materials, personal products, etc.) and outdoor sources (e.g. car exhaust emissions, coal and oil combustion, pollen, road dust, etc.) which enter the room through ventilation systems.
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