The revision of International Organization for Standardization (ISO) standard ISO 1999 [(1971). International Organization of Standardization, Geneva, Switzerland)] in 1990 was based on two noise and hearing study databases, one presented by Burns and Robinson [(1970). Hearing and Noise in Industry (Her Majesty's Stationary Office, London)] and the other by Passchier-Vermeer [(1968). Report No. 35 and Supplement to Report No. 35 (Institute for Public Health Engineering, the Netherlands)]. However, the mathematical expression of these data in ISO 1999 neither closely predicts the distribution of hearing threshold levels in these two databases nor those in the National Institute for Occupational Safety and Health database. As a result, lower estimates of the risk of noise-induced hearing impairment are found using ISO 1999. An explanation of the revision is needed to justify these lower risk values.
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