临床实践表明,慢性支气管炎(简称“慢支”)发病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”发病人数与月极端最低气温成反相关,即温度降低,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 Clinical practice shows that the highest incidence of chronic bronchitis (referred to as “chronic bronchitis”) generally occurs in every year from November to January next year, the incidence of these three months accounted for about 50% of the year. The analysis of meteorological data showed that the number of “chronic bronchitis” patients was inversely correlated with monthly extreme minimum temperature, ie, the temperature was lower and the number of patients was more. However, it was positively correlated with the frequency of northerly winds because of the monsoon climate in our country, "often