To compensate for the lack of occupational exposure values and toxicological data, as well as the limitations of current sampling techniques, a committee of experts proposed a control banding model for facilitating the selection of appropriate respiratory protection against the great diversity of infectious and non-infectious bioaerosols present in workplaces. Easy to use, the proposed model consists of the four risk groups used in biosafety (1. low risk for individuals and communities; 2. moderate risk for individuals, low for communities; 3. high risk for individuals, low for communities; 4. high risk for individuals and communities) and five exposure levels (very low, low, medium, high, very high). Data cross-tabulation is used to establish an assigned protection factor (APF) that occupational health and safety practitioners will take into account in choosing appropriate respiratory protective equipment.
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