最近,北京四中的13位同学制作了《PM2.5防御手册》发放给全校师生,提醒大家关注健康,关注环境。手册分为PM2.5来源、雾霾危害、防护建议、如何保护蓝天等几大块。为了获得最权威的数据,他们花了两个多月的时间查找资料,还进行口罩防护效能的对比等。据了解,该校的环保社团将在校园内建立通报系统,把每天的天气质量状况及时播 Recently, 13 students from Beijing No. 4 made “PM2.5 Defense Handbook” to all teachers and students to remind everyone to pay attention to health and concern for the environment. Manual is divided into PM2.5 sources, haze hazards, protection advice, how to protect the blue sky and other major. In order to obtain the most authoritative data, they spent more than two months looking for information, but also compare the effectiveness of mask protection. It is understood that the school’s environmental community will establish a notification system on campus, the daily weather quality and timely broadcast