攀枝花市城区PM_(2.5)与气态前体物的变化特征研究

Study on Variation Characteristics of PM_(2.5) and Correlations with Its Gaseous Precursors in Urban Atmosphere of Panzhihua

对2014年1月~12月攀枝花市城区五个测点PM2.5自动监测浓度及气态前体物浓度进行分析,主要探讨攀枝花市城区PM2.5浓度变化特征与气态前体物的关系。研究发现,攀枝花市PM2.5日均浓度变化呈双峰型,PM2.5浓度日变化趋势和NO2、SO2、CO的变化趋势相似,与O3变化趋势相反。PM2.5质量浓度季节变化趋势为：冬季〉春季〉夏季〉秋季。PM2.5浓度除与O3浓度相关性较差外,与其他气态前体物（NO2、SO2、CO）相关性明显。

Concentration of PM2. 5 and its gaseous precursors from 5 automatic air monitoring stations in urban area of Panzhihua from January to December in 2014 were analyzed to study their variation characteristics and correlation. The results showed that the diurnal changes of PM2.5 concentration exhibited double peaks distribution. The diurnal changes of PM2.5 concentration was similar to that of NO2, SO2 and CO, but opposite to that of 03. The seasonal variations of PM2.5 concentration showed as winter 〉 spring 〉 summer 〉 autumn. The PM2. 5 concentration showed a positive correlation with NO2 , SO2 , and CO concentration, and negative correlation with 03 concentration.