Noise Exposure Hazards

Exposure to high sound levels and/or sharp impact sounds for sustained periods,

coupled by the effects of getting older can reduce or impair hearing levels.

Noise is a recognized workplace hazard that must be assessed, eliminated or

controlled.

Area sound level measurements and noise dosimeters are taken at various workspaces

to identify where noise levels would exceed 85 dBA over an 8-hour work period. If a

noise hazard is identified, the first step is to mitigate the hazard to prevent temporary or

permanent hearing loss.

High Noise Locations

Before we dive into the plan's specifics, let’s pinpoint the domains of elevated noise

levels. These encompass activities spanning the use of power tools, operating mobile

equipment, navigating road traffic, and various construction undertakings. Identifying

these high-noise areas serves as a crucial step toward curbing potential hearing risks

among employees.

Legislation requires employers to perform a hearing noise exposure assessment at

levels of 82 dBA, however, single hearing protection is not needed until 85 dBA.

Here are some examples of common sounds at 82 dBA

1. Office Environment: An average office environment with computers, printers,

and conversations can generate noise levels around 60-70 dBA. If there's

additional noise from air conditioning systems or background conversations, the

overall noise level might reach around 82 dBA.

2. City Traffic: Regular city traffic noise, including cars passing by and honking,

typically falls in the range of 70-85 dBA. A busy urban street during rush hour

could easily average around 82 dBA.

3. Construction Site (Distance): When standing at a moderate distance from a

construction site, the combined noise from various equipment such as drills,

trucks, and machinery might register around 82 dBA.

4. Vacuum Cleaner: A typical household vacuum cleaner produces noise levels of

around 70-80 dBA. Some more powerful vacuum cleaners might reach closer to

82 dBA.

5. Dishwasher: A running dishwasher can create noise levels ranging from 45 to

75 dBA, depending on the model and cycle. A noisier dishwasher could easily

contribute to an environment reaching 82 dBA.

6. School Playground: The noise on a busy school playground during recess, with

children playing and shouting, can easily reach around 80-85 dBA.

7. Restaurant or Café: The combined noise of conversations, clattering of dishes,

and background music in a moderately busy restaurant or café might average

around 75-85 dBA.

Elements of a Noise Exposure Plan

Noise Exposure Assessments

At the heart of the plan lies the task of gauging the amount of noise exposure

employees may be or are exposed to. Find your high noise zones, get a sound level

meter, or contract a third party with a meter and test the dBA’s at different locations with

different tasks. Once the assessment is complete, based on legislation requirements of

duration of exposure and noise level, we can easily decide what controls are needed.

Noise exposures in the workplace will be maintained below Occupational Exposure

Limits. Wherever possible, this will be done through engineering controls (including

substitution of less noisy equipment, process modifications, enclosure of noisy

equipment, isolation of the worker, and acoustic treatments as appropriate).

Where engineering controls are not possible, administrative controls, safe work

procedures, and worker training will be used to minimize exposure. Hearing protection

must be used as a last resort.

Where noise levels exceed 96 dBA, dual hearing protection (insertable plugs muffs)

should be worn, but must be worn where noise levels exceed 105 dBA in order to

provide adequate hearing protection.

Revision to OHS Code Part 16 - The threshold for conducting a noise exposure

assessment is being reduced from 85 decibels to 82 decibels. This is to ensure

noise is assessed before the occupational exposure limit is exceeded.

Occupational Health and Safety shall work with field personnel to conduct noise surveys

at all locations where the noise levels may be greater than 82 dBA.

There is also a requirement to ensure workers are fit tested for the hearing protection

devices they use and wear, and that testing must meet the updated CSA Z.94.2-14

(R2019) standard.

Fit Testing

Fit testing of hearing protection can be conducted either quantitatively or

qualitatively.

Quantitative methods are the preferred standard, but these require specialized

equipment (example: Audiometric testing).

Qualitative methods are simpler to perform and rely on the worker’s sense of hearing.