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Chlorine is a respiratory irritant.
The gas irritates the mucous membranes and the liquid burns the skin. As little as 3.5 ppm can be detected as an odour, and 1000 ppm is likely to be fatal after a few deep breaths. It was used as a war gas in 1915. Strange Matter cartoon included by kind permission of Nick Kim at the University of Waikato , New Zealand. All rights reserved.