Workplace Noise

Measuring Exposure

And Calculating A Suitable Level Of Protection.

Workplace Noise

Noise is common amongst most industrial processes, and exposure to high noise levels can lead to permanent hearing loss also known as noise induced hearing loss.

By measuring exposures to noise in the workplace, the quantification of exposure will help in determining an adequate method of control required to reduce daily exposures.

If the environment requires the use of hearing protection, suitable attenuation levels can be calculated using the frequency readings obtained during the noise assessment. Therefore, the workforce can be provided with suitable and sufficient hearing protection which has an acceptable attenuation level.

Often, general wear and tear of tools, mechanical components and machinery can increase noise levels in the workplace. Therefore, we do advise assessments to be undertaken annually.

Noise exposure levels are measured using personal dosimeters and sound level meters. These pieces of equipment should be fitted with at least a class 2 microphone which is a minimum standard for taking noise measurements in line with the Control of Noise at Work Regulations 2005.

As part of our assessments, we undertake personal sampling by fitting personal dosimeters onto the shoulders of your workers, leaving these to measure for a significant proportion of the shift. In addition, fixed place noise readings are obtained using a sound level meter. Exposures are then measured against the lower exposure action values, upper exposure action values, and exposure limit values. 

Exposure Limit Values
Daily Exposures based on an 8-hour Time Weighted Average dB(A):

Lower Exposure Action Value 80dB(A)


Upper Exposure Action Value 85dB(A)


Exposure Limit Value. 87dB(A)

Peak Sound Pressure Levels dB(C):

Lower Exposure Action Value 135dB(C)


Upper Exposure Action Value 137dB(C)


Exposure Limit Value. 140dB(C)


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