2024年2月16日 · The NIOSH recommended exposure limit (REL) for occupational noise exposure is 85 A-weighted decibels (dBA) over an eight-hour shift. If workers are repeatedly exposed to noise at or above the REL, employers must provide a hearing loss prevention program.

According the National Institute for Occupational Safety - NIOSH - the exposure to noise should be controlled so that the exposure is less than a max combination of exposure level - L - and duration - t. The maximum time of exposure at a noise level can be calculated as:

2016年2月8日 · In 1998, NIOSH established the REL for occupational noise exposures to be 85 decibels, A-weighted (dB [A]) as an 8-hour time-weighted average. Exposures at or above this level are considered hazardous.

OSHA’s noise level standards require employers to implement a hearing conservation program for noises at 85 dBA and higher. The safe listening time for 85 dBA is 8 hours. This decreases by half with every increase of 3 dB for noises above 85 dBA.

If you take 85 dB for 8 hours, then in would be 82 dB for 16 hours and 79 dB for 32 hours. So interpolating, 80 dB is roughly 24 hours. (If you want to be technical, it is actually 25 hours and 24 minutes.) Below are the supposedly safe exposure times (if you take the 80 dB level at 24 hours/85 dB at 8 hours as your base).

2024年10月23日 · Noise above 85 dB, especially when exposure lasts longer than eight hours, can cause gradual hearing loss due to loud noises. For example, power tools can reach around 100 dB, and concerts or sports events often exceed 110 dB, which can lead to hearing damage after just a few minutes of exposure.

If we need to shout at a friend who is an arm’s length away, or we can hear music coming out of another person’s headphones, the volume is at least 85 dB, which is the maximum “safe level” for workplace noise exposure over the course of an eight-hour day.

85 dB: Safe for 8 hours; 90 dB: Safe for 2 hours; 95 dB: Safe for about 50 minutes; 100 dB: Safe for about 15 minutes; 110 dB: Immediate danger; no safe exposure time; These guidelines illustrate how quickly risk increases with higher noise levels. Staying aware of both volume and duration is key for anyone wanting to protect their hearing health.

100% Dose (or 100 points) = 85dBA for 8 hours. This is known as the ‘Criterion’ level. In other countries, Dose may be specified with a different criterion i.e. 100% Dose = 90dBA for 8 hours may also be specified. Learn more about Dose - Noise at Work Training Course

8-Hour Time-Weighted Average: Average noise exposure figured for an 8-hour period. Permissible Exposure Level (PEL): Maximum allowable 8-hour TWA noise exposure (OSHA's limit is 90 dBA). Noise Dose: Percent of PEL to which worker exposed. 90 dBA 8-hour TWA equals a dose of 100%. An 85 dBA 8-hour TWA equals 50%. The exchange rate is used to ...