New South Wales Consolidated Regulations
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OCCUPATIONAL HEALTH AND SAFETY REGULATION 2001 - REG 50
Definitions
50 Definitions
In this Division:
"atmospheric contaminant" means:
(a) a hazardous substance that occurs in the
form of a fume, mist, gas, dust or vapour, or
(b) an asphyxiant, or
(c)
nuisance dust,
to which persons may be exposed in the working environment.
"inspirable dust" means those airborne particles of dust that can be taken in
through the nose or mouth during breathing.
"respirable fibre" means a fibrous particle with a diameter of less than 3
micrometres and a length of greater than 5 micrometres, with a length to width
ratio of greater than 3:1, that can reach the deepest part of a lung.
"safe oxygen level" means a minimum oxygen content in air of 19.5% by volume
under normal atmospheric pressure and a maximum oxygen content in air of 23.5%
by volume under normal atmospheric pressure.
"synthetic mineral fibre" means any manufactured mineral fibre, including
mineral woolrock (rockwool and slagwool), glasswool (including superfine
glassfibre) and ceramic fibres.
"synthetic mineral fibre dust" means dust arising from a synthetic mineral
fibre.
"TWA" (time-weighted average) means the average airborne concentration of a
particular substance when calculated over a normal 8-hour working day for a
5-day working week.
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