(3) TWA ppm Time weighted Parts of vapour or gas per million parts of average contaminated air by volume mg/m³ Milligrams of substance per cubic metre of air. Where the words Refer to Section 3.3 for more information on the 'peak limitation' units for exposure standards. When an entry is in appear in this column, this column only, the value is exact: when listed the value is the peak with a ppm value, it is approximate. limitation exposure standard. f/mL Fibres per millilitre of air as determined by the membrane filter method (4) STEL ppm and mg/m³ (see above) Short term exposure limit. Carcinogen category 1 (5) Established human carcinogen 2 Probable human carcinogen 3 Substances suspected of having carcinogenic potential Notices Sk (6) Indicates whether the Absorption through the skin may be a significant contaminant can be source of exposure absorbed through the Sen skin and/or is a sensitiser. Sensitiser Notes (a) This is for inhalable dust containing no asbestos and < 1% crystalline silica. (b) Fibres longer than 5 width less than 3 and with an aspect ratio of not less than 3:1, m, m as measured by the membrane filter method, at 400-650X magnification phase contrast illumination. (c) Lint free dust as measured by the vertical elutriator for cotton dust sampler described in the Transactions of the National Conference on Cotton Dust and Health 1970, North Carolina University Press, Chapel Hill, pp. 33-43, 1971.
(3) TWA Time weighted average Where the words 'peak limitation' appear in this column, the value is the peak limitation exposure standard. ppm Parts of vapour or gas per million parts of contaminated air by volume mg/m³ Milligrams of substance per cubic metre of air. Refer to Section 3.3 for more information on the units for exposure standards. When an entry is in this column only, the value is exact: when listed with a ppm value, it is approximate. f/mL Fibres per millilitre of air as determined by the membrane filter method (4) STEL Short term exposure limit. ppm and mg/m³ (see above) (5) Carcinogen category 1 Established human carcinogen 2 Probable human carcinogen 3 Substances suspected of having carcinogenic potential (6) Notices Indicates whether the contaminant can be absorbed through the skin and/or is a sensitiser. Sk Absorption through the skin may be a significant source of exposure Sen Sensitiser Notes (a) This is for inhalable dust containing no asbestos and < 1% crystalline silica. (b) Fibres longer than 5 m, width less than 3 m and with an aspect ratio of not less than 3:1, as measured by the membrane filter method, at 400-650X magnification phase contrast illumination. (c) Lint free dust as measured by the vertical elutriator for cotton dust sampler described in the Transactions of the National Conference on Cotton Dust and Health 1970, North Carolina University Press, Chapel Hill, pp. 33-43, 1971.
workplace-exposure-standards-airborne-contaminants-v1.docx