摘要
The Healthy China Initiative(2019—2030)states that chronic non-communicable diseases are now the main cause of death and represent the largest disease burden in China.Deaths due to cardiovascular and cerebrovascular diseases,cancers,chronic respiratory diseases,diabetes,and other chronic noncommunicable diseases account for 88% of the total deaths and more than 70% of the total disease burden.1 In China,the three principal causes of chronic respiratory diseases are severe air pollution,smoking and second-hand smoke,and major acute respiratory diseases.
