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Where the risks are low, the actions you take may be simple and inexpensive, but where the risks are high, you should manage them using a prioritised noise-control action plan.

The damage is disabling in that it can stop people being able to understand speech, keep up with conversations or use the telephone.

People often experience temporary deafness after leaving a noisy place. Although hearing recovers within a few hours, this should not be ignored. It is a sign that if they continue to be exposed to the noise, their hearing could be permanently damaged.

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Hearing loss is not the only problem. People may develop tinnitus (ringing, whistling, buzzing or humming in the ears), a distressing condition which can lead to disturbed sleep.

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This guidance will help you understand what you may need to do as an employer to protect your employees from noise, particularly if your business involves using:

A risk assessment revealed that the noise level at the operator's position of a metal cutting guillotine was very high, at 92 decibels (dB).

As an employer, you must assess and identify measures to eliminate or reduce risks from exposure to noise so that you can protect the hearing of your employees.

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If your workers use hand-held tools these may also transmit vibration into their hands and arms. Find out about preventing harm from vibration.

Such hearing loss could have been prevented in the short term with hearing protection. In the longer term, other ways of reducing exposure included quieter machines, maintenance, and changing job patterns.

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Noise is measured in decibels (dB). An 'A-weighting' sometimes written as 'dB(A)', is used to measure average noise levels, and a 'C-weighting' or 'dB(C)', to measure peak, impact or explosive noises. You might just notice a 3 dB change in noise level, because of the way our ears work. Yet every 3 dB doubles the noise, so what might seem like small differences in the numbers can be quite significant.

After taking technical advice, the employers ensured the guillotine was fully serviced and its hydraulics overhauled. In addition, a collecting tray was fitted with rollers and covered with carpet, to reduce the impact of falling offcut metal.

This will depend on how loud the noise is and how long people are exposed to it. You will probably need to do something about the noise if any of the following apply:

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The pi symbol (π) is a mathematical sign which is also used in Greek letters. There are several ways to display a pi symbol using HTML and unicode. You can either copy and paste or use the pi code in your document. See some examples below:

Noise at work can interfere with communications and make warnings harder to hear. It can also reduce a person's awareness of his or her surroundings. These factors can lead to safety risks – putting people at risk of injury or death.

The Control of Noise at Work Regulations 2005 require employers to take action to prevent or reduce risks to health and safety from noise at work.

A woman working in the textiles industry only realised something needed to be done about her hearing loss when, at the age of 40, she couldn't hear the phone ringing any more.

Loud noise at work can damage your hearing. This usually happens gradually and it may only be when the damage caused by noise combines with hearing loss due to ageing that people realise how impaired their hearing has become.