临床实践表明,慢性支气管炎(简称“慢支炎”)发病率最高时段一般出现在每年的11月至次年的1月,这三个月的发病率约占全年的50％。气象资料分析发现,“慢支炎”发病人数与月极端最低气温成反相关,即温度越低,发病人数越多,而与偏北风的频率成正相关。这是因为我国属季风气候,“偏北风”常常说明北方冷空气南下, Clinical practice shows that the highest incidence of chronic bronchitis (referred to as “chronic bronchitis”) generally occurs in the period from November to January of each year, the incidence of these three months accounted for about 50% of the year. Meteorological data analysis found that the incidence of chronic myositis was inversely correlated with the monthly minimum temperature, ie, the lower the temperature, the more the number of patients and the more the frequency of the northerly winds. This is because China is a monsoon climate, “northerly wind” often shows the north cold air south,