Japan Technical Guidelines for Application of Concentration Standards for Prevention of Health Impairment Caused by Chemical Substances

Japan Technical Guidelines for Application of Concentration Standards for Prevention of Health Impairment Caused by Chemical Substances are formulated by the Ministry of Health, Labour and Welfare in conjunction with the Ministry of Economy, Trade and Industry and the Ministry of the Environment, issued as official technical documents under the Industrial Safety and Health Act. Based on international toxicological data and domestic Japanese epidemiological studies, these guidelines establish category-specific concentration standards by substance class (such as organic solvents, heavy metals, and specified chemical substances), including time-weighted average concentrations (TWA), short-term exposure concentrations (STEL), and maximum allowable concentrations (MAC). Extremely stringent control limits are set for high-risk substances such as benzene, asbestos, and lead, accompanied by special prevention rules.