Carbon monoxide is a gas, no taste of the high toxicity to human health is very dangerous, because breathing is limited too, will result in the blood oxygen to reduce injury or harm the nervous system may be fatal. Only about 0,1 of carbon monoxide concentrations in the air may also be life threatening. Gas shrinkage is no color, odor and stimulation caused by the reaction should not be dangerous, because people do not feel the presence of limited air.
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