最近,某大城市进行的一项调查发现:学生总是“睡不醒”与教室的空气质量有关。二氧化碳浓度过高,氧气供应不足是孩子们嗜睡的主要原因。国家规定的清新空气标准是每立方米二氧化碳不超过0.1毫克左右,而在调查中被检测的几个教室每立方米二氧化碳含量都在0.3毫克,超过指标两倍。 无独有偶,在人员密集的白领写字楼里,不少白领人士也常有白天昏昏欲睡的现象。 “室内人数太多是空气不达标的原因之一,四五十人挤在一间大屋子里,每个人占有的空间太小了。”有关人员解释,“不注意通风导致了缺氧的加 A recent survey conducted in a big city found that students are always “awake” related to the air quality in the classroom. High levels of carbon dioxide, oxygen shortage is the main reason children lethargy. The fresh air standard stipulated by the state is not more than 0.1 mg / m3 of carbon dioxide. However, in several classrooms tested in the survey, the content of carbon dioxide per cubic meter was 0.3 mg, more than twice the target. Coincidentally, in staff-intensive white-collar office buildings, many white-collar workers also often drowsy phenomenon during the day. “Indoor too many people is one of the reasons the air is not up to standard, four or five people crowded in a big room, each person has too little space.” The officer explained, "Do not pay attention to ventilation led to hypoxia plus