摘要
Asthma is a common chronic inflammatory disorder that is more prevalent in children than in adults.China has seen an increasing prevalence of childhood asthma in recentdecades[1].Earlier studies have shown that air particulate matter (PM),particularly fine particulate matter(PM2.5)[2],is an important factor triggering childhood asthma. Since nationalPM2.5data were nota vailabl euntil 2013,
基金
supported by the Development Foundation of Shanghai Meteorological and Health Key Laboratory [QXJK201606]
the Investigation of Science&Technology Basic Resources Program of China [2017FY101206]
the General Program Foundation of Hebei Meteorological Bureau [17KY10]
