HONG KONG WEB DIRECTORY

IAQ has become one of the leading environmental issues of the '90's. Studies have shown that the concentrations of hazardous of pollutants are often many times higher indoors than out-of-doors. Why is there a problem with the quality of the air? As construction method responded to the increasing costs of energy, modem buildings have reduced levels of "leakage" or "infiltration of fresh air. Buildings with tighter construction are more energy efficient to operate. This energy efficiency comes with a trade-off, less fresh air in the building. Reductions in fresh air exchanges result in a building with "stale" air. The chemicals present in the building and gases produced by the furnishings and contents are no longer diluted by fresh air. The level of purity, and quality of the air has become reduced.

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