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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 Noise

Article 4.The measurement of equivalent noise level at such indoor workplaces prescribed in item 3, Article 21 of the Cabinet Order (limited to those indoor workplaces listed in each item, Article 588 of the Ordinance on Industrial Safety and Health) shall be made in accordance with the provisions specified in the following:

  1. Vertical and horizontal lines are drawn at equal intervals of not more than 6 m on the floor of a unit work area and a sampling point is provided at each intersection of those lines at a position 120 to 150 cm above the floor (except such a point where measurement is very difficult due to equipment etc.). However, when it is obvious that the noise level at unit work area is substantially uniform, vertical and horizontal lines can be drawn at equal intervals of more than 6 m on the floor of a unit work area and a sampling point provided at each intersection of those lines.
  2. Sampling points shall be provided at not less than 5 proper points though when they become less than 5 points then the above rule is applied regardless of the provisions of the preceding item. However, when the unit work area is very narrow and it is obvious that the noise level is substantially uniform, the number of sampling points may be less than 5.
  3. At such a unit work area where work is performed at a place in close vicinity to the source of noise level in addition to the measurement prescribed in preceding two items, measurement shall be made at such a time when the noise level seems to become the highest of those hours during which the work is performed at such a position where the work is performed.
  4. Measurement shall be made in accordance with the following instructions:
    1. An instrument (hereinafter referred to as 'sound level meter') to be used for measurement shall be such an instrument that conforms to the standards provided by JIS C1502 (sound level meter) or one that has equivalent or higher capacity.
    2. Measurement shall be made by using the A-weighted network of a sound level meter.
  5. The measurement of equivalent noise level at one sampling point shall be made continuously for not less than 10 minutes.
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