1.1 Definition of exposure limits
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1.1 Definition of exposure limits

 "An exposure limit value" means the highest acceptable average concentration (time-weighted mean value) of a substance or, in some cases, of a mixture of substances in the air breathed by the occupants. The concentrations are usually given in parts per million (ppm) or mg/m3. An exposure limit value refers either to a long term exposure level or a maximum limit value. Short-term exposure level is also used.

"Long-term exposure level" means the exposure limit value for exposure during the entire working day (normally 8 hours).

"Maximum exposure level" means the highest concentration reached.

"A short-term exposure level" means the time-weighted mean exposure value over a short period of 10 or 15 minutes, dependent upon national occupational exposure standards.

Parent topic: 1 Requirements
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