Atmospheric Pollution Characteristics Of Hefei And Its Relationship With Emission Reduction

In recent years, the city’s atmospheric pollution characteristics and the relationship between the emission reduction and air quality improvement is a hot issue in the field of environment. This paper analyzed the characteristics of atmospheric pollution in Hefei and the emission reduction status quo in Anhui Province. Using an air quality model to estimate the connection between them, we made a simulation analysis of the NOx drop impact on NO₂ concentration. The main conclusions are as follow:The concentration of SO₂, NO₂,PM₁₀,PM_2.5 in Hefei are difference in different seasons, the SO₂ concentration curve varies as an inverted U with timed, the NO₂ concentration carve varies as an U with timed.The PM₁₀ and PM2.5 concent-ration curves both have double peaks. The spatial distribution of SO₂, NO₂,PMio and PM2.5 is also discussed in this paper.The concentration of SO₂ at Huposhan-zhuang,Mingzhuguanchang and Luyangqu monitoring stations is larger than other stations.The concentration of NO₂ is highest at Sanlijie and Mingzhuguangchang monitoring stations. The concentration of PM₁₀ in Chanhjiangzhonglu and luyang-qu monitoring station is slightly higher than other stations. The concentration of PM2.5 in most stations are similar with PM₁₀. The correlation coefficient bwteen PM2.5 and PM₁₀ is 0.888, the particle size ratio of PM2.5 to PM₁₀ is 67.4%.By using LMDI（Logarithmic Mean Divisia Index） decomposition analysis method, the variation of industrial waste gas total emissions of Hefei and Anhui Province from 2011 to 2014 was decomposed into Structural factors effect. The emission intensity factor effect and the effect of economic growth factor. The results showed that the emission strength factor plays the most important role in Anhui, the the adjustment of industrial structure plays the most important role in Hefei.We compiled a WRF-Chem numeric air quality model to simulation the relationship between total emissions of NOX and NO₂ concentration.When the total emission of NOx has a 20% cut, the average concentration of NO₂ in hefei decrease 4.61μg/m3, its coresponding percentage is 16.2%. Furthermore, the simulation indicated that the emission in Anhui province does a contribution of 81.2% of the concentration of NO₂ in Hefei, while the emission in Hefei does a contribution of only 63.4%.