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Working Environment Evaluation Standards
Ministry of Labour Notification No. 79 of September 1, 1988

Latest Amendments:
Ministry of Health, Labour and Welfare Notification No.192 of April 27, 2001

In Japanese

(Scope)

Article 1.This notification shall apply to workshops listed in items l, 7, 8 and 10 metallic materials or carbon in the air of such indoor workplaces prescribed in item 1, Article 21, the Enforcement Order of Industrial Safety and Health Law (Cabinet Order No. 318, 1972, hereinafter referred to as the Cabinet Order) shall be measured in accordance with the provisions specified in the following :

(Evaluation of the Results of the Measurement)
  1. Article 2.Evaluation of the results of the working environment measurement prescribed in paragraph 1 of Article 65-2 of the Industrial Safety and Health Law shall be carried out by classifying into Control Class 1 to Control Class 3 as listed in the right column of the following table, according to the case in following items, for each unit work area, prescribed in item 1 of paragraph 1 of Article 2 of Working Environment Measurement Standards (Ministry of Labour Notification No. 46, 1976), hereinafter the same.
    1. In cases where only A Sampling (sampling carried out according to items 1 to 2 of paragraph 1 of Article 2 of the Working Environment Measurement Standards, including cases where the same provisions are applied mutatis mutandis in paragraph 4 of Article 10, paragraph 2 of Article 11 or paragraph 4 of Article 13, hereinafter the same), has been carried out.
      Control Class
      2 of paragraph 1 of Article 2 of the Working Environment Measurement level for the substances to be measured as prescribed in Attached Table
      Control Class I
      1st evaluation value is less than administrative control level
      Control Class II
      1st evaluation value is equal to or more than administrative control level and 2nd evaluation value is equal to or less than administrative control level
      Control Class III
      2nd evaluation value is more than administrative control level
    2. In cases where both A Sampling and B Sampling (sampling carried out with the provision of item 2-2 of paragraph 1 of Article 2 of the Working Environment Measurement Standards, including cases where the same provisions are applied mutatis mutandis in paragraph 4 of Article 10, paragraph 2 of Article 11 or paragraph 4 of Article 13, hereinafter the same), have been carried out.
      Control Class
      Result of comparison of evaluation value or measured value of B sampling and administrative control level for the substances to be measured as prescribed in Attached Table
      Control Class I
      Both 1st evaluation value and measured value of B sampling (in cases where B sampling was carried out at more than 2 sampling points, the largest value shall be adopted, hereinafter the same) are less than administrative control level
      Control Class II
      2nd evaluation value is equal to or less than administrative control level, and measured value of B sampling is equal to or less than 1.5 times administrative control level (excluding cases classified as Control Class l)
      Control Class III
      2nd evaluation value is more than administrative control Level, or measured value of B sampling is more than 1.5 times administrative control level
  2. In a unit work area which has sampling points where the concentration of substances to be measured was less than the lower limit value of the sampling method or the analysis method adopted for the measurement, the lower limit value should be used as the measured value of the point to carry out the classification of the preceding paragraph.
  3. In a unit work area which has sampling points where the concentration of substances to be measured was less than one tenth of Administrative Control Level, classification of paragraph 1 may carried out by using one tenth of the Administrative Control Level as the measured value of the measuring point.
  4. In a unit work area pertaining to a mixture including more than 2 organic solvents stated in items 1 to 47 of Attached Table 6-2 of the Enforcement Order of Industrial Safety and Health Law, classification of paragraph 1 should be carried out by using a converted value calculated by the following formula for each sampling point. In this case, I shall be used as the Administrative Control Level.
    C=C1/E1+C2/E2+...
    In this formula, C, C1, C2... ... and E1, E2... ... represent the following values.
    C
    Converted Value
    C1, C2... ...
    Measured value for each organic solvent to be measured.
    E1, E2... ...
    Administrative Control Level for each organic solvent to be measured.
(Calculation of Evaluation Value)
  1. Article 3.1st evaluation value and 2nd evaluation value of paragraph 1 of preceding Article should be calculated by the following formulae.
    logEA1=logM1+1.645√log²σ1+0.084
    logEA2=logM1+1.151(log²σ1+0.084)
    In these formaulae, EA1, M1, σ1 and EA2 represent the following values.
    EA1
    1st evaluation value
    M1
    Geometrical mean of measured values of A sampling
    σ1
    Geometrical standard deviation of measured values of A sampling
    EA2
    2nd evaluation value
  2. Notwithstanding the provision of' the preceding paragraph, in cases when measurement was conducted for 2 successive workdays (in case there was rational reason why the measurement could not be conducted for 2 successive workdays, 2 workdays with the minimum interval), 1st evaluation value and 2nd evaluation value can be calculated by the following formulae.
    logEA1=1/2(logM1+logM2)+1.645√1/2(log²σ1+log²σ2)+1/2(logM1-logM2)²
    logEA1=1/2(logM1+logM2)+1.151{1/2(log²σ1+log²σ2)+1/2(logM1-logM2)}
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