Hearing Conservation and Noise Induced Hearing Loss

Noise is one of the most common hazards in the workplace. Prolonged exposure to excessive noise from machinery, processes, and equipment can lead to permanent hearing loss if it is not properly controlled. Noise-induced hearing loss is one of the leading occupational diseases in Ontario.

In addition to hearing damage, high noise levels can negatively impact workers in several ways. Excessive noise may cause physical and psychological stress, reduce productivity, and interfere with communication. It can also increase the risk of incidents and injuries by making it difficult to hear warning signals, moving equipment, or nearby coworkers.

Although noise-induced hearing loss cannot be cured, it is entirely preventable. The most effective approach is to eliminate or reduce noise at the source whenever possible.

Controlling Noise Exposure

Engineering controls are the preferred method for reducing workplace noise. Examples include:

• Isolating or enclosing noisy equipment
• Relocating machinery to separate areas
• Using sound-absorbing materials where appropriate

For example, softer flooring materials, such as carpet or certain rolled coverings, can help reduce noise compared to hard tile or ceramic surfaces.

Where noise levels cannot be adequately reduced—particularly in environments averaging 85 dB over an 8-hour workday—hearing protection is required. This includes the use of personal protective equipment (PPE), such as earplugs or earmuffs, along with a formal hearing protection program.

Trent University Hearing Protection Program

Trent’s Hearing Protection Program ensures that all workplace parties understand and comply with the Ontario Occupational Health and Safety Act and Ontario Regulation 381/15: Noise.

When selecting hearing protection devices, the following factors must be considered:

• The noise levels workers are exposed to
• The level of noise reduction (attenuation) provided by the device
• The manufacturer’s instructions, limitations, and proper use

It is important to note that hearing protection devices are only effective when they are properly used, maintained, and cared for according to manufacturer guidelines.

Training Requirements

Workers who may be exposed to hazardous noise levels are required to complete Trent University’s Hearing Conservation and Noise-Induced Hearing Loss eLearning module, available through VIP.