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Working Environment Measurement Standards
Ministry of Labour Notification No. 46 of April 22, 1976

Latest Amendments:
Ministry of Health, Labour and Welfare Notification No. 191 of April 27, 2001
作業環境測定基準：原文

Measurement of Concentration of Specified Chemical Substance etc.

Article 10.The measurement of concentration of those substances listed in 1 to 7, item 1, Attached Table 3 of the Cabinet Order and in 1 to 36, item 2 of the same Table, in the air of such workplaces (indoor workplaces wherein to manufacture or handle the specified chemical substances, or a workplaces wherein to manufacture coke on a coke oven) listed in item 7, Article 21 of the Cabinet Order shall be made as provided in the following:

    1. Measurement shall be made according to the classification listed in the left column of Attached Table 1 by using a sampling method listed in the middle column of the Table or an equivalent or higher method in capacity and an analytical method listed in the right column of the Table or an equivalent or higher method in capacity.
    2. The measurement of concentration of asbestos (excluding amosite and crocidolite) dust in the air shall be made by one of the following methods:
      1. Filtration sampling method and numerical counting method
      2. Filtration sampling method and X-ray diffractometry
  2. Notwithstanding the provisions of preceding item 1, the measurement of concentration of those substances in the air listed below may be made by a method using a gas detector tube. This rule, however, does not apply to such a case when the concentration of one of those substances listed in the following items is to be measured and a co-existing substance other than the substance concerned may adversely affect an accurate measurement.
    1. Acrylonitrile
    2. Vinyl chloride
    3. Chlorine
    4. Hydrogen cyanide
    5. Hydrogen fluoride
    6. Benzene
    7. Hydrogen sulfide
  3. Notwithstanding the provisions of the preceding two paragraphs, in case of the measurement of items 1 through 7 of the preceding paragraph, it may be done by a method using a gas detector tube only under the approval of the Chief of the competent Labour Standards Inspection Office. The approval may be given in cases where the evaluation of working environment measurement which is prescribed in paragraph 1, Article 36-2, Ordinance on Prevention of Hazards due to Specified Chemical Substances (Ministry of Labour Ordinance No. 39, 1972) has been done for more than 2 years, and those results are all classified into Control Class 1. In this case, measurement for chemicals listed in item 1 of paragraph 1 should be simultaneously performed at more than one measuring point in the unit work area concerned.
  4. The provisions set forth in items 1 to 3, paragraph 1 of Article 2 shall apply mutatis mutandis to the measurement provided in the preceding three paragraphs. In this case, "dust of sand and stones, rocks, ores (minerals), metallic materials or carbon" prescribed in items 1, 1-2 and 2-2, paragraph 1 of the same Article shall be read as "substances listed in 1 to 7, item 1, Attached Table 3 of the Cabinet Order and those listed in 1 to 36, item 2, the same Table", and "relative concentration indication method" described in proviso of item 3 of the same paragraph shall be read as "direct collection method or a method using a gas detector tube".
  5. The provision of paragraphs 4 through 7, Article 2 shall apply to the approval provided in paragraph 3.
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