Dioxide, CO2 poisoning is a condition of coma and cerebral hypoxia caused by the body inhaling high concentrations of carbon dioxide. Generally speaking, when the carbon dioxide content in the atmosphere exceeds 1%, the human body will experience mild poisoning; when the concentration exceeds 3%, breathing difficulties begin to occur; when it exceeds 6%, it may cause severe poisoning or even fatality.
It is worth noting that even if the concentration of carbon dioxide CO2 is less than 1%, it still has an impact on the human body. U.S. workplace regulations stipulate that the eight-hour average carbon dioxide CO2 concentration must not exceed 0.5% (5000 ppm). At such concentrations, crews on the International Space Station experienced headaches, drowsiness, dullness, irritability, and sleep disruption. Animal experiments show that exposure to such conditions for eight weeks can lead to loss of bone density and kidney calcification. The study also pointed out that even a concentration of 0.1% (1000 ppm) can significantly reduce cognitive ability after 2.5 hours of exposure, which may be related to carbon dioxide increasing cerebral blood flow. Research on office environments shows that compared to 500 ppm, when the carbon dioxide concentration reaches 1,000 ppm, office white-collar workers’ activity levels and information usage capabilities are significantly reduced.
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