1 – 1.5 % Slight effect on chemical metabolism after exposures of several hours
3 % The gas is weakly narcotic at this level, giving rise to deeper breathing, reduced hearing ability, coupled with headache, an increase in blood pressure and pulse rate.
4 – 5 % Stimulation of the respiratory centre occurs resulting in deeper and more rapid breathing. Signs of intoxication will become more evident after 30 minutes exposure.
5 – 10 % Breathing becomes more laborious with headache and loss of judgement.
10 – 100 % When the carbon dioxide concentration increases above 10%, unconsciousness will occur in under one minute and unless prompt action is taken, further exposure to these high levels will eventually result in death.
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