空气中的二氧化碳含量一般为0.03～0.1%,氧气为20.9%。当二氧化碳含量增加到1.74%时,人们的呼吸就会加快、加深。换气量比原来增加1.5%倍;二氧化碳含量增加到10.4%时,人的忍受力就不能坚持到30秒钟以上;二氧化碳含量增加到30%左右,人的呼吸就会受到抑制,以致麻木死亡。按氧气来说,当氧气下降到12%时,人的呼吸就会明显加快;氧气下降到5%时,人就会出现神智模糊的症状;如果人们从 The carbon dioxide content of the air is generally 0.03 to 0.1%, oxygen is 20.9%. When the carbon dioxide content increased to 1.74%, people’s breath will be accelerated and deepened. Ventilation than the original increase of 1.5% times; carbon dioxide content increased to 10.4%, the human endurance can not stick to more than 30 seconds; carbon dioxide content increased to 30%, human breathing will be suppressed, resulting in numbness death . According to oxygen, when the oxygen drops to 12%, the human breath will be significantly accelerated; oxygen drops to 5%, people will appear vague symptoms; if people from