Respirators protect workers against insufficient oxygen environments, harmful dusts, fogs, smokes, mists, gases, vapors, and sprays. These hazards may cause cancer, lung impairment, diseases, or death. Obscured vision may occur when a respirator interferes with vision (i. e. , downward gaze or visual acuity) or through fogging of the lens of a full facepiece respirator (johnson, 2016).
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