Carbon dioxide poisoning is one of the problems of space
The carbon dioxide concentration of the international space station is higher than the average value. The concentration of carbon dioxide on Earth is about 0.3 mm Hg, but at the International Space Station it can reach 6 mm Hg. Undesirable side effects such as headaches, burning and sleep problems that are common among astronauts are a number of consequences of excessive carbon dioxide concentrations. In fact, most astronauts complain of headaches in their missions.