Noise Exposure Assessment in Working Places

References: Guidance Notes Factories and Industrial Undertakings (Noise at Work) Regulation, Labour Department, HKSAR

For a responsible employer, it is necessary to provide a safety working condition to your employees, it is not only enhance working efficiency, and moreover, it could protect your employees not being hurt during the working time. Noise at works always is a neglectful and potential risk, it may not cause damage to your employees immediately, but regular exposure to high noise levels over a long period of time may result in permanent and incurable hearing loss.


Action Levels and the Main Requirements

A daily personal noise exposure can be regarded as the total exposure throughout the working day, taking into account the average noise levels in working area and time spent in them, but without the onsideration of any ear protector worn. The peak pressure is the highest pressure of the sound wave.


The three action levels defined in Noise at Work Regulation are:

a) First Action Level - a daily personal noise exposure (LEP, d) of 85 dB (A)

b) Second Action Level - a daily personal noise exposure (LEP, d) of 90 dB (A)

c) Peak Action Level - a peak sound pressure level of 140dB or peak sound pressure of 200 Pa


The Regulation requires the employer to take certain basic steps where an employee is likely to be exposed to noise at or above the First Action Level. The first thing need to do is finding a competent person to assess the noise exposure at working places and sending assessment report to Labour Department within 28 days, but the assessment procedure and reporting format is difficult for the layman in acoustics and occupation safely to understand.

Assess the Noise with Competent persons Acoustics and Air Testing Laboratory's staff have appropriate qualification to complete the Noise Assessment and prepare the Noise Assessment Report for Labour Department.


Our Noise Assessment service includes the following items:

1. propose a corrected assessment method;

2. carry out assessment with accurate instrument;

3. survey and investigate workers job routine;

4. record the results and explain them to clients;

5. interpret assessment result and prepare report to Labour Department; and

6. propose the practicable noise reduction method.


Reduce the Noise at Sources

The active method to solve the noise problem at working place is reducing the noise at source, which is the most effective and easy method. Building enclosure on the plant, adding lining on the wall, reduce the machine vibration etc. are the common solution. Our company can provide services of design and build those products to suit your need.


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Noise Exposure Assessment in Progress

Noise Exposure Assessment in Progress


Job Reference

1.   ENSR International (2001)
Noise Exposure Assessment for Cabot Plastics Hong Kong Ltd

2.   ENSR International (2001)
Noise Exposure Assessment for Printing House