Noise is a major occupational hazard. Short term effects of noise exposure include temporary hearing loss, stress, annoyance, difficulty in verbal communication, and safety hazards. The primary long-term health effect of noise exposure is permanent hearing loss. Both shortterm and long-term effects can be prevented by timely recognition, evaluation and control of noise exposure. This guide provides an overview of the methods of recognition, evaluation and control of workplace noise exposure. Topics covered include: a review of the units and measures of noise; methods of measuring noise level and noise exposure; instruments used to measure noise; the relationship between noise exposure and risk of hearing loss; noise exposure limits; engineering methods of noise control; and the effectiveness of hearing protectors. Basic components of a hearing conservation program are outlined.

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