Abstract
Temporary threshold shifts (TTSs) were measured in 17 subjects (12 drivers and five riders) following 120 minutes of snowmobile noise exposure. All subjects were found to exhibit marked TTS at frequencies above 1,000 hertz. Predictably, the greatest amount of TTS occurred at 4,000 Hz. An acoustic analysis of the snowmobiles represented in this study revealed that the noise levels exceeded damage risk criteria for two hours exposure. One snowmobile was found to produce as much as 136 dBA at full throttle.
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