Earmuffs & Noise Reduction

Need To Know: Noise & Hearing Protection NOISE & HARM “Sound is what we hear. Noise is unwanted sound”“Sound is what we hear. Noise is unwanted sound” as defined by the OSH Answers, noise can be continuous, variable, intermittent or impulsive depending on how it changes over time. As measured in decibels (dB) or A-weighted decibels (dBA), sound around us such as a normal conversation can produce about 65 dBA, hair dryer/ lawnmower about 90 dBA, concert/ sporting event/ ambulance siren about 120 dBA, and fireworks display/ jet engine at takeoff about 140dBA. According to the ACGIH established exposure guidelines...