Occupational diseases caused by breathing contaminated air is avoided primarily by engineering control measures that prevent atmospheric contamination. When effective engineering controls are not feasible or while they are being instituted, an appropriate respirator must be used. Respirators can be classified into two types: air-purifying respirators that remove contaminants from the ambient air and atmosphere-supplying respirators that provide air from a source other than the surrounding atmosphere (National Institute for Occupational Safety and Health, 1987a). Except for special cases, air-purifying respirators are used most frequently in routine workpractices because they are smaller, more easily maintained, and restrict the wearer’s movements the least. Thus, the focus of this article is on air-purifying respirators.
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- Quantitative Fit Testing Techniques for Respirators Protecting the Human Respiratory System against Environmental Aerosols
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