Control of noise at work: what employers must do

Noise at work is regulated because, loud enough and for long enough, it causes permanent damage to hearing - which is why the law requires it to be controlled rather than tolerated. Exposure to loud noise over time damages the hearing, causing noise-induced hearing loss and conditions like tinnitus (ringing in the ears), and this damage is permanent - once the hearing is lost, it does not come back. So noise is not just an unpleasant working condition but a cause of lasting disability, built up gradually from exposure that may not seem harmful day to day. The permanence of the harm is what makes noise a serious workplace-health matter, and what the Regulations exist to prevent.

As with other causes of permanent harm, the emphasis is on prevention, because the damage cannot be undone once done. Noise-induced hearing loss develops gradually and often unnoticed - people do not feel their hearing being damaged, and may not realise until the loss is established - so without a framework requiring exposure to be assessed and controlled, it would be easy to let it accumulate until the harm is done. The Control of Noise at Work Regulations provide that framework: they require employers to assess and control noise exposure, with specific values that trigger action, so the risk is managed before the irreversible damage occurs. So noise is regulated, with defined values and duties, precisely because the hearing damage it causes is permanent - and the law aims to prevent it through a concrete framework of assessment, control and protection.

Pulling the duties together, an employer's obligations under the Control of Noise at Work Regulations follow a clear pattern. Assess the noise exposure: identify where workers are exposed to noise, and assess the levels against the exposure values, so the employer knows where they stand and which duties apply. Control the exposure: where the action values are reached, reduce the noise so far as reasonably practicable - by controlling it at source as the preferred approach - and keep the exposure below the limit value. Provide hearing protection: make it available at the lower action value, and provide and enforce it in hearing protection zones at the upper action value, to supplement the source controls.

And provide health surveillance: where there is a risk to health from the noise, provide health surveillance - regular hearing checks for the exposed workers - so that any early signs of hearing damage are detected, and action taken to protect those individuals before it worsens. Since the damage is permanent, catching it early and preventing further harm is the best that can be done once it starts. Together, these duties - assess, control, protect, survey - are what the Regulations require an employer to do about noise. Meeting them means going through the noise exposures in the workplace, assessing each against the values, controlling and protecting as required, and surveying where there is a risk. This is how the abstract requirement to protect workers from noise becomes concrete action. For an employer with noise in the workplace - from machinery, processes, or equipment - these are the steps: know the exposure, reduce it at source, protect where needed, and watch for harm. Because the hearing damage is permanent, meeting these duties is the way to prevent a lasting, disabling injury to the workers exposed.