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常开窗户是为了让新鲜空气不断地流入室内。不开窗户,室内的空气就会变得污浊。人从空气中吸入氧气,经过新陈代谢,产生二氧化碳,被排出体外。根据科研结果,人体吸入的空气中二氧化碳占0.03％,而呼出的空气中二氧化碳达4.4％。因此,长时间不开窗户,二氧化碳的含量会不断增高,氧气的成份相对减少。当空气中的二氧化碳含量达到0.7～1.0％时,对人的身体就有一定影响,会出现呼吸
Often open the window is to allow fresh air constantly flowing into the room. Do not open the window, the indoor air will become dirty. People from the air inhaled oxygen, after metabolism, produce carbon dioxide, was excreted. According to scientific findings, the human body inhaled air accounted for 0.03% of carbon dioxide, and exhaled carbon dioxide up to 4.4%. Therefore, for a long time without opening the window, the content of carbon dioxide will continue to increase, the relative composition of oxygen decreased. When the air of carbon dioxide content of 0.7 to 1.0%, the human body will have some impact, there will be breathing