The noise level from racing could be measured also, although it might be logistically more difficult. Other Factors Second, there are several features of stockcar racing that could affect hearing. Most stock cars have a semi-enclosed cockpit, in contrast to Formula 1 or Indy cars, which have open cockpits. The stockcar cockpit is open on the left side with presumed greater noise exposure to the left ear and therefore possibly greater noise-induced hearing loss in the left ear. If such asymmetry exists, it could be an indicator of relative contribution of racing to hearing loss.
Some drivers wear headsets to maintain radio contact with their pit.
This practice could reduce noise exposure, or it may not, depending on the loudness and duration of noise exposure from voice communication. Either way, it would be useful to determine whether the driver used a headset. Further, drivers are also likely exposed to gasoline vapors, which could have the same synergistic effect as organic solvents used in the occupational environment. Finally, whether any noise-induced hearing loss is compensable depends on the specific requirements in the state where the claim is filed. In others, claimants are required to provide more information and the above information could be germane to a claim.