Did you know that after 15 minutes at 100km/h your hearing is already damaged? Noise levels are measured in decibels (dB). At sound levels of 110dB or more, you will risk immediate and permanent hearing damage. At lower sound volumes (80-110dB) the risk to your hearing is dependent on the duration for which you are exposed to the sound.
The noise volume we can withstand ‘without damage’ for a few minutes represents a significant risk of hearing damage if the period of exposure is longer.