Research Of The Atmospheric Particulate Matter(PM2.5) In Different Regions Of North Qinling Mountains

In this paper, according to the requirements of“Shaanxi Provincial Forest ‘negative oxygen ions, PM2.5, SO2’ monitor the implementation of the program(trial run)”, I selected the representative of alpine mixed forests( arbor forests), shallow mixed forests( shrubbery), suburban(plain) farmland(shrub grass), the types of city open area for fixed monitoring, I set the experiment sites in the Taibai Mountain National Nature Reserve(Houzhenzi protection Station, Zhouzhi), Shanxi Province Louguantai National Forest Park(Louguan town, Zhouzhi County), Niubeiliang Nature Reserve(Dongcao Village, Dazhao Street, Chang’an District), Shaanxi Design Institute of Forestry(Xishaomen, Xi’an) for experimental monitoring. Studied on seasonal variation regularity, diurnal variation of four monitoring points selected, especially in Louguantai National Forest Park of themonitoring points was studied under different weather conditions, different wind speed and different positions of PM2.5 changes.By doing this study, I have got the following conclusions:(1) According to the monitoring data of four monitoring sites from April 2013 – April 2014, the results showed that the higher forest cover the stronger weakening effect of PM2.5,of course,the lower forest cover the weaker weakening effect of PM2.5.(2) In the same region, the pollution concentrations of PM2.5 was highest in spring, lowest in summer. The general rules for spring> winter> autumn> summer.(3) Four monitoring points, Taibai Mountain and Louguantai two monitoring points, the average value is lower than the national average standard value of 35 ug/m3, while the Niubeiliang and Design Institute, two monitoring points, the average value is higher than the national average standard value of 35 ug/m3.(4) we studied the four monitoring points when they had the highest concentration of pollution in spring, the results showed that only the daily monitoring data of Taibaishan did not exceed the daily standard level(75 ug/m3) of the atmospheric particulate matter(PM2.5) in the spring months, Louguantai only April 10 th monitoring value did notexceed the daily standard value of 75 ug/m3. Niubeiliang, Design Institute in the spring of three months, each monitoring value exceeded the daily standard value of 75ug/m3, which belonged to the atmospheric particles exceed the standard.(5) I had continuously monitored the atmospheric particulate matter(PM2.5) and(PM10) in Louguantai National Forest Park from April 10 to April 30, 2014, and looked into the relevance between(PM2.5) and(PM10). I also checked the different impacts of locations, weathers, and the wind speeds on PM 2.5. The conclusion was that PM 2.5 went upward together with PM 10. The influences of different weathers varied as well------cloudy days affected most, then sunny days, and rainy days had the least effect. PM 2.5, moreover, decreased when the wind speeds fastened. The data from different locations of a same monitoring point showed that PM 2.5 went down when the green coverage rate rose.