Decibel level guidelines
|Decibel Level (dBA)
||Shouted conversation from 2 metres away - acceptable level of risk in work environment
Pneumatic drill or motorcycle
||Movie theatre peaked at this level for Godzilla in 1998
Immediate damage to hearing
Our Workplace Health and Safety laws state that workers should not be exposed to noise levels over 85 decibels (dBA) over a period of eight hours a day, five days a week. 85dBA is like someone shouting at you from two metres away, a vacuum cleaner or a noisy restaurant. See the table above or to the right for examples of decibel levels.
If you work in an environment that's noisy, make sure you:
- wear hearing protection
- take breaks from the noise
- give your ears time to recuperate.
It's a good idea to apply the same advice to your leisure activities as well.
Ear buds and headphones
If you like your music turned right up, try to limit the amount of time you spend listening to it. You should be able to hear a conversation taking place a metre away when you have your ear buds in or headphones on. If you can't hear it, turn down your volume.
If you can hear the music from someone else's headphones or ear buds, it's also a pretty good indication that they have their music turned up too loud. Action on Hearing Loss recommends "regular breaks from the music or other noise source. Aim for at least 10 minutes' break every hour".
The sound scale
It may be tempting to increase the volume when listening to a media player to cover other noises such as traffic, road works or the conversations of others nearby, but the sound scale is logarithmic – so a small increase in dBA is a large increase in the intensity of sound.
Say we listen to music at 85dBA, and raise the volume to 95dBA – our ears register that increase as a doubling in volume because of the way we hear sound, but the power behind it has increased by ten times, doubling for each increase of 3dBA.
Our ears can handle high volumes for a short period – at 95dBA, our limit is 15 minutes – but longer listening will cause ringing in the ears or head and may cause permanent damage. In 2005, the National Acoustics Laboratory released research that showed around 25% of people listen to music on personal media players at volumes beyond recommended workplace levels.
So when you can't help but increase the volume on your favourite song, remember to turn it back down again afterwards.
Max volume controls
Portable media players and smart phones often have the capacity for playing above safe volume levels. As hearing loss has been further researched, some manufacturers, such as Apple and Sony, have proactively made controls available that limit volume, but these need to be activated by the consumer.
Apple has also made parental controls available for the volume of their portable media players that implement a code so children can't undo the volume limitation.