人,一刻也离不开空气。新鲜空气提供充足的氧气,促进人体的新陈代谢。冬春季节,如果经常关闭门窗,室内空气不流通,氧气减少,二氧化碳增多,空气就不清洁卫生,温、湿度也相对增高,适宜于病菌、病毒的孳生繁殖,容易使人生病。如麻疹、百日咳、流行性感冒、流脑、白喉等呼吸道传染病,就是因为空气中污染了病菌、病毒,通 People, a moment can not be separated from the air. Fresh air provides plenty of oxygen to promote the body’s metabolism. Winter and spring, if you often close the doors and windows, indoor air does not flow, oxygen reduction, carbon dioxide increased, the air is not clean, warm, humidity is relatively high, suitable for bacteria, viruses breeding, easy to make people sick. Such as measles, whooping cough, influenza, meningitis, diphtheria and other respiratory diseases, it is because the air pollution of germs, viruses, through