risk assessment

There are several knowledge gaps that explains a lack of knowledge on minimum ventilation rates for intercepting airborne respiratory infection. One is a lack of unifying understanding of the roles of ventilation, filtration, settling, deactivation, and most importantly temporal and spatial variation. A recent finding on the equivalence of the occupied air volume per person and dilution and a generalized Wells-Riley equation are used to define a unified dilution air flow rate. The required threshold dilution air flow rate is not a function of the setting.

Numerous scientific studies show that indoors are the source of potentially harmful substances called indoor air pollutants. They come from various sources. Indoor levels are often much higher than outdoor level and most people spend the bulk of their time indoors. As indoor air pollution is relatively new problem, health and comfort problems are associated with it. The starting point for studies on constituents of the indoor environment is to realize that the problem to be solved is complex.