Gases liable to cause death or serious injury to human health if inhaled. Gas poisonous by inhalation means a material which is a gas
at 20ðC or less and a pressure of 101.3 kPa a material which has a boiling point of 20ðC or less at 101.3kPa 14.7 psi which is known
to be so toxic to humans as to pose a hazard to health during transportation, or in the absence f adequate data on human toxicity, is
presumed to be toxic to humans because when tested on laboratory animals it has an LC50 value of not more than 5000 ml/m3.
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