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Earplugs and Earmuffs Noise reduction safety.
Ear protectors, that is earplugs and/or earmuffs are an Occupational Health and Safety requirement where employees are habitually exposed to a noise exceeding 85 decibels during the course of an eight hour day.
Properly fitted earplugs or earmuffs can reduce noise up to 15 to 30 dB. The better earplugs and muffs are approximately equal in sound reduction, although earplugs are better for low frequency noise and earmuffs for high frequency noise. Simultaneous use of earplugs and muffs usually adds 10 to 15 dB more protection than either used alone. Combined use should be considered when noise exceeds 105 dB.