Sound levels that cause hearing loss begin at about 85 dB(A). Hearing loss occurs more quickly with louder noise. For long time exposure to various sound levels which can lead to hearing loss. OSHA standards consider sound measured at 85 decibels or higher as damaging to the eardrum and therefore a risk to hearing.
Reduction of excessive noise is the first step to hearing protection. Hearing protection starts with ear Plugs Ear plugs are made to fit into the ear opening. A snug, tight fit is necessary for effective sound reduction. Ear plugs can be a source of ear infection; so they must be kept clean and sanitized. Do not share ear plugs with others as ear infection can be spread in this way. There are two types of ear plugs: • Formable Plugs These plugs are compressed before inserting into the ear. They expand to fill the ear canal. One size fits all. • Preformed Plugs These plugs come in many sizes and must be fitted to the individual’s ear. They usually have a cord attached between each plug making them more difficult to lose. Ear-protection devices are ranked by their Noise Reduction Rating (NRR). An NRR31 rating signifies that noise will be reduced by as much as 31 decibels under ideal conditions. For example, in a 100 dB(A) work area, a device with a NRR of 31dB would reduce the effective sound level to 69dB. Be sure that the hearing-protection device reduces sound to a safe level. Typical ratings are shown. Device dB NRREar Muffs 21-31 Ear Plugs 26-33 Combined Add 3-5 db. Commercially available hearing protection, Acoustical ear muffs offer the greatest level of hearing protection because they cover the entire ear and ear canal.