Normally this requires a combination of medical expertise and engineering expertise.  We can provide the latter and determine how loud the offending noise was likely to have been and compare it with certain limits relating to hearing damage.  We can do so by measuring the noise ourselves, or by carrying out research into the sound source and considering the environment in which the noise exposure occurred.  The medical expert can use these levels, together with other information, such as the claimant’s audiogram, to determine if a noise induced hearing loss was likely to have resulted from the exposure.