Oxygen levels below 19.5% may cause asphyxia. Carbon dioxide exposure can cause nausea and respiratory problems. High concentrations may cause vasodilation leading to circulatory collapse.

• 空气中氧含量低于19.；5%25就可能引起窒息。二氧化碳暴露可引起恶心及呼吸困难。高浓度暴露可因血管扩张而导致循环衰竭。