Sounds above 85 dB are likely to cause damage to your hearing, with sound between 120-180 dB, such as motorcycles, firearms or an explosion being extremely dangerous. Sounds less than 80 dB - even after prolonged exposure - are unlikely to do so.

In most cases, hearing loss is very gradual, so if you are noticing a reduction in your hearing it is very important to see your GP, who will then direct you to an ear, nose and throat specialist who can determine the underlying cause. Don't worry, as most cases appear to resolve themselves spontaneously without medical intervention, however it is advisable to get checked over by a profession to make sure.

A clinician will probably play sounds of different amplitudes and frequencies to determine in which range you are able to hear sounds. A reduction of 30 dB in three consecutive frequencies is classified as hearing loss.

There are two rules: First, if you have to raise your voice to talk to someone who is an arm's length away, then the noise is likely to be hazardous. Second, if your ears are ringing or sounds seem dull or flat after leaving a noisy place, then you probably were exposed to hazardous noise.

Anyone regularly exposed to hazardous noise should have an annual hearing test. Also, anyone who notices a change in his/her hearing (or who develops tinnitus) should have his or her ears checked. People who have healthy ears and who are not exposed to hazardous noise should get a hearing test every three years.