Attenuation is defined by CSA Standard Z94.2-14 (R2019) Hearing protection devices - Performance, selection, care, and use as вЂњthe reduction in sound pressure level incident upon the ear due to the application of a hearing protector or, specifically, the change in hearing threshold level that results when a hearing protector is worn.вЂќД¬alculating noise attenuation of hearing protection and de-rating noise reduction values (NRR) For these reasons, training on the correct fit, and making sure users have a thorough understanding of hearing loss are important elements of the hearing conservation program.Дetailed calculations of the protection provided by a hearing protector involves using octave band analysis of the workplace noise and the noise attenuation provided by the hearing protector for noise in each octave band. The вЂњreal worldвЂќ results are often different than laboratory tests with the main reasons for this difference being poor fit, and lack of proper training, supervision and enforcement.

These rating systems attempt to estimate the actual sound protection provided by hearing protectors when worn in actual working environments (vs. The NRR, or other similar systems such as the single number rating (SNR), is a method to more accurately determine the effective exposure of a person when wearing a hearing protector. What types of hearing protectors are available? Able to provide adequate communication and audibility needs (e.g., the ability to hear alarms or warning sounds).Appropriate for the temperature and humidity in the workplace.Compatible with other required personal protective equipment, or communication devices.Provides adequate protection or noise attenuation.Refer to the Canadian Standards Association (CSA) Standard Z94.2-14 (R2019) вЂњHearing Protection Devices - Performance, Selection, Care and UseвЂќ or contact the agency responsible for occupational health and safety legislation in your jurisdiction for more information. Radio/music earphones or headsets are not substitutes for hearing protectors and should not be worn where hearing protectors are required to protect against exposure to noise. To maintain their effectiveness, the hearing protection should not be modified. The effectiveness of hearing protection is reduced greatly if the hearing protectors do not fit properly, are not inserted or worn correctly, if they are worn only periodically, or if they are removed even for a short period of time. A hearing conservation program includes noise assessment, methods for controlling noise, hearing protector selection, employee training and education, audiometric testing, maintenance, inspection, record keeping, and program evaluation.

If hearing protection is required, then a complete hearing conservation program should be implemented. Hearing protectors reduce the noise exposure level and the risk of hearing loss when worn correctly.

For most jurisdictions, this occupational exposure limit is 85 decibels (A-weighted) or dBA.

People should wear a hearing protector if the noise or sound level they are exposed to is close to or greater than the occupational exposure limits (OEL) for noise.

Decibel ear plugs