Toxic gas refers to the gas that is harmful to human body and can cause poisoning. Common toxic gases include carbon monoxide, sulfur dioxide, chlorine, chemical poison gas, phosgene, diphosphate, hydrogen cyanide, mustard gas, Lewis poison gas, etc.
Due to the physical and chemical characteristics of toxic gas itself, as well as the physiological and biochemical characteristics of tissues in the human body, the toxic gas absorbed by the human body will accumulate in some tissues or organs of the human body, showing the 'selectivity' and 'affinity' of toxic gas to these tissues or organs. After metal or metalloid toxic gases such as lead, mercury and arsenic are absorbed by the human body, they are mainly distributed in bones, liver, kidneys, intestines, lungs and muscles. Benzene, carbon disulfide and other organic solvent toxic gases are easy to be distributed in bone marrow, brain marrow and fat rich tissues. （YouDuQiTiYouNaXie）