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Disposable respirators are the general industry term for face masks designed to protect the wearer from inhaling hazardous atmospheres, including fumes, vapors, gases, and particulate matter such as dusts and airborne microorganisms. Disposable respirators come in many different styles and sizes, to accommodate all types of face shapes. The differences in respirator design impact the respirator assigned protection factors (i.e., the resulting degree of protection from which kind of hazard). These respirators are designed to be thrown away after use. In North America, the National Institute for Occupational Safety and Health (NIOSH), under authorization of the Occupational Safety and Health Act of 1970, provides a testing, approval, and certification program assuring respirators used in the workplace meet the standards of 42 CFR Part 84. NIOSH respirators are rated N95, N99 and N100 according to their filtration capability. The N95 is by far the most popular disposable respirator for use in the United States.