Study On Emission Reduction Target Of Air Pollutants In Wuhan Based On WRF/CALPUFF Model

The improvement of air quality in the urban environment has attracted worldwide attention,and the establishment of appropriate targets for emission reduction of air pollution sources is one of the key factors in improving the quality of the ambient air.Therefore,based on present characteristics of Wuhan air quality of the environment,this thesis carried out some research on the evaluation of the current status of ambient air quality in Wuhan.The typical atmospheric pollution source emission data in the Wuhan region were collected,the atmospheric environmental capacity of the region was calculated using the WRF/CALPUFF coupling model,and the typical atmospheric pollution source emission reduction targets were determined.1.Data collection methods and mathematical statistics methods were used to construct data lists of environmental monitoring data,geographical data,meteorological data,and typical atmospheric pollution source emission data in Wuhan urban areas.On this basis,the air quality index method was used to carry out the assessment of the ambient air quality in Wuhan,and the key factor or major pollutant that affected the ambient air quality in Wuhan was identified as PM_2.5,followed by O₃,PM₁₀,and NO₂.2.Based on the WRF/CALPUFF coupling model method,the 3D meteorological field and the concentration distribution characteristics of PM_2.5,NO₂,and SO₂ in Wuhan were simulated.The results show that the simulated meteorological field has tight relationship with the variation characteristics of pollutant concentration.There was a good correlation between the simulated results of PM_2.5,NO₂,SO₂.and the actual monitoring data.This indicates that the WRF/CALPUFF coupling model can truly reflect the relationship between the atmospheric pollution source emission and the concentration of pollutants.3.Based on the simulation method,the environmental capacities of SO₂,NO_x,and dust in Wuhan were calculated to be 159669t?94346t and 68750t.Compared with actual emissions,SO₂ still had 77814t of environmental capacity remaining while NO_x and dust had run out of environmental capacity.In order to achieve ambient air quality standard the emission reduction targets of NO_x and dust were 26626t and 44167t.The NO_x emission reduction of vehicle source was the highest?17932t?,and the dust emission reduction target of industrial source was the highest?40871t?.4.Based on the emission reduction targets of NO_x and dust,combined with current distribution of pollutant emission,air quality improvement measures were proposed.