OSHA Technical Manual (OTM) - Section III: Chapter 5 ...
2013-8-15 · Keep earplugs or muffs with you at all times and wear them whenever you are in an area that the employer has designated as a noise-hazardous zone (e.g., by posting signs or if your escort tells you hearing protection is required), when you find that measured noise levels approach 85 dBA, and any other time that you suspect that noise levels are elevated.
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