Carbon dioxide itself is non-toxic. Under normal circumstances, the carbon dioxide content in the air accounts for about 0.03 percent of the total volume of the atmosphere, which has no effect on the human body. However, when the concentration of carbon dioxide in the air is higher than 1%, people will feel stuffy, dizzy, and palpitations; when the concentration is higher than 5%, there will be symptoms of poisoning, such as headache, vomiting, confusion, etc.; when the concentration reaches 10%, People will lose consciousness, respiratory center paralysis, and even death. Therefore, the concentration of carbon dioxide in the air above a certain limit can make people suffocate.

Please note that although carbon dioxide itself is non-toxic, when its concentration is too high, it will have an adverse effect on human health due to the relative decrease in oxygen concentration. At the same time, high concentrations of carbon dioxide also have a negative impact on the environment. Therefore, in a closed and poorly ventilated environment, we should remain vigilant and take timely measures to reduce the concentration of carbon dioxide.