Abstract
THE research literature is dotted with numerous accounts which ascribe to the deleterious effect of high intensity sound upon the hearing mechanism. Considerable effort has been extended in attempts to objectify noise exposure data and arrive at realistic damage-risk criteria. These criteria have been advanced to prescribe the amount of permissible exposure to high intensity sound.1-8 Because of medico legal potentialities, industry and the military have provided the major impetus for study of destructive sound levels. It is becoming apparent, however, that the recreational environment is glutted with hazardous sound-generating devices which justify study and control. Significant indications of the trend toward increasingly dangerous sound levels in the nonoccupational milieu is pointed out in two recent surveys. Weber et al9 relate, in a report of an analysis of 1,000 Colorado school-age young people with hearing loss, that high frequency hearing impairment (HFI) among older children is considerably more

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