Gully Howard Technical’s qualified Occupational Hygienists provide a range of Noise Services and can assess employees’ noise exposure in the workplace. We also provide detailed advice on how to comply with the Control of Noise at Work Regulations (CNAWR) and reduce the risk of Noise Induced Hearing Loss (NIHL).


NIHL affects 17,000 persons in the UK. Exposure to excessive noise at work can cause permanent and disabling deafness and other hearing problems such as tinnitus (ringing in the ears).

Hearing damage can be caused by regular exposure to prolonged loud noise over the working day or a single extremely loud impulsive noise event.

The CNAWR requires employers to assess and control the noise exposure of their employees.

The CNAWR sets lower and upper exposure action values and limit values for noise averaged over a working day and for peak noise events. The exposure limit values (ELVs) must not be exceeded. If the action levels are exceeded then a set of specific actions are required.

If the daily lower exposure action value (LEAV) is exceeded (average noise exposure between 80 and 84 dB(A)) then employee information, instruction and training (IIT) is required and personal hearing protection should be provided – if employees request it.

If the daily upper exposure action value (UEAV) is exceeded (average noise exposure 85 dB(A) or above) then in addition to IIT, mandatory hearing protection, designation of hearing protection zones and employee health surveillance (hearing tests) is required.

However, the fundamental requirement of CNAWR is to control employees’ noise exposure by a series of technical and organisational measures, rather than relying on personal hearing protection.

Contact Us for Noise Services

Please contact us to discuss your Occupational Hygiene service requirements. Email: or alternatively, please telephone our dedicated Occupational Hygiene department on: 023 9272 8040.