Study On The Dynamic Change Of PM2.5 Concentration In Air And Heavy Metal Content In PM2.5 In Chenzhou Area

Atmospheric particulate matter-also known as particulate matter(PM)or particulates-are microscopic solid or liquid matter suspended in the Earth’s atmosphere,fine particles with a diameter of 2.5 μm or less,it stays long in the atmosphere,distances long transmission and has strong activity,it easy to carry poisonous and harmful materials(e.g.heavy metal、organisms and so on),it seriously impacts on such as human life and health these series of problems.From Jan.1 201 5,it has started monitoring of six national standard parameters of air quality automatic monitoring in Chenzhou urban areas.This article has made use of the work,by combining the field sample collection with the indoor monitoring analysis method,studied the relationship between the concentration distribution characteristics of PM2.5 in air and the index concentration of SO2、NO2、CO、O3、PM 10、Pb、Cd and so on in air in Chenzhou from 201 5-2016,aimed at providing scientific basis for the prevention of air pollution sources or pollutants and the safety of air environment quality in Chenzhou.The results obtained are as follows:PM2.5 concentration and AQI index were highly coincident in Chenzhou,positive correlation with PM10,no direct correlation with other pollutants.No direct correlation between PM2.5 concentration and humidity in Chenzhou,Inverse correlation with rainfall.No direct correlation between PM2.5 concentration and air temperature in Chenzhou,positive correlation with wind days.The whole performance was the lowest in summer,lower in spring and autumn,the highest in winner.Because the main PM2.5 pollution is produced in the non smelting,mining and other high pollution industries,the proportion of toxic heavy metals in PM2.5 of Chenzhou is very low.There is no direct correlation between the heavy materials of PM2.5 and the local dust in Chenzhou,does not constitute PM2.5 poution.According to the survey,most of the material in PM2.5 of Chenzhou can be absorbed by the environment,we should be rational to treat PM2.5.PM2.5 is a way to restore in the natural world,it’s a state of the material migration in nature.In the traditional culture and environmental protection,we shouldn’t be too much emphasis on the decline in the absolute value of PM2.5,but pay more attention to the material of PM2.5 that real impact the natural ecology,for example,PM2.5 in Chenzhou and the dust in the surrounding area were detected to contain Pb(plumbum),occasionally detected to contain As(arsenic).