2. Reducing the risk
The ideal solution would be to eliminate the noise completely, for example by changing the way a task is carried out. However, in all likelihood this will not be possible, so a programme of technical and organisational measures to reduce employee noise exposure should be implemented.
- Technical measures may include making changes to noisy equipment such as replacing metal surfaces with rubber, placing enclosures around the noise source and using silencers on fans.
- Organisational measures include looking at the way the work is carried out to reduce the amount of time exposed to the noise or increasing the distance from the noise source.
Implementing a programme of technical and organisational controls is specifically required by law under the Control of Noise at Work Regulations 2005, which require employers to take reasonably practicable action to reduce the risks.
The regulations define the greatest risk as being when there is a daily noise exposure at or above the upper exposure action value of 85dB. This is an 8-hour time-weighted average, often referred to as a ‘noise dose’, which means that it is the combination of the noise level and the amount of time exposed to that noise which creates the risk. For example, if your employees carry out a generator test at a noise level of 110dB for 3 minutes, their personal daily noise exposure for that task alone would be 88dB, which is above the upper exposure action value.
There is also a single upper exposure action value of 137dB for peak C-weighted sound pressure level, this is not based on exposure time and is more likely to occur with very loud impact sounds, or in very loud industries such as in aviation and the military. It could also be encountered with some musical instruments too, such as drums.
The risk of hearing damage can also be mitigated by providing hearing protection, and it is mandatory when personal daily exposure is 85dB or above. However, the regulations state that it is not sufficient to rely on hearing protection alone. A recent 2025 campaign by the HSE found that in the high noise workplaces they visited:
- 75% of employees lacked essential knowledge about storing hearing protection, checking for damage, or reporting equipment faults to employers; and
- 80% of employees had deficiencies in their training related to hearing protection, including receiving no instruction on proper wearing techniques.
This highlights one of the main reasons why hearing protection should be a last resort or interim measure and should not be relied on as a single control measure; human factors make it too easy to not achieve the required level of protection to prevent hearing damage.