金沙本底站空气质量与颗粒物浓度变化特征分析

利用华中区域代表性站点金沙国家大气本底站2007—2018年的PM_(2.5)、PM_(10)颗粒物质量浓度数据,2019年3月—2019年6月反应性气体数据,对华中区域空气质量进行整体评价,并分析了颗粒物浓度的变化特征及其影响因素。结果表明,反应性气体CO、SO_(2)、NO、NO_(2)质量浓度其日平均最大值、平均值均达到一级标准,O_(3)日平均值超标率为10.6%,PM_(2.5)超标率为18%,PM_(10)超标率为17%。从颗粒物质量浓度多年变化来看,2007—2013年金沙站大气颗粒物质量浓度属于上升趋势,2013年至今质量浓度呈现下降趋势,风向风速也在一定程度上影响颗粒物的来源。

Analysis of Variation Characteristics of Air Quality and Particulate Matter Concentration at Jinsha Atmospheric Background Station

Based on the PM_2.5 and PM₁₀ mass concentration data from 2007 to 2018,and the reactive gas data from March 2019 to June 2019 from Jinsha National Atmospheric Base Station,which is a representative station in Central China,this study evaluated the overall air quality in Central China and the variation characteristics of particulate concentration and analyzed its influencing factors.The results showed that daily maximum and average values of particulate matter concentrations of CO,SO₂,NO and NO₂ reached the first-class standard,but daily average values of O₃,PM_2.5 and PM₁₀ exceeded the national air quality standards of 10.6%,18%,and 17%,respectively.The annual variations of particulate matter concentrations presented an upward trend from 2007 to 2013 and a downward trend from 2013 to the present.This study also found that the source of particulate matter is partly affected by wind directions and wind speeds.