Study On The PM_2.5 Variation Caused By The Implementation Of The Emission Standards Of Air Pollutants For Thermal Power Plants And Motor Vehicle Source

PM_2.5 absorb large amounts of harmful substances easily, it not only has a harmful effect on human health, but also has produced great influence to the environment and climate. PM_2.5 has become the primary pollutants in many cities, it is also the focus of ambient air quality management for a period of time in China. As the pollution source of PM_2.5, thermal power plants has implemented the 2011-version emission standards of air pollutants for thermal power plants （ESTP）, motor vehicle has begun to implement emission standards of air pollutants for motor vehicle in the fifth phase of China（ESMV）.Based on the emission standards of air pollutants for thermal power plants and motor vehicle,3 schemes and 8 scenarios were set up. Referenced to domestic and foreign scholars’research experiences, a grid emission inventory of the thermal power plants and motor vehicles in China was established based on the MEIC emission inventory and related statistical data. The WRF-CMAQ model system was used to simulate PM_2.5 variation and thermal power plants and motor vehicles contribution to PM_2.5 caused by different emission standards at various stages. Based on that, to evaluate the effect of PM_2.5 concentration owing to the implementation of standards and predict the contribution rates of thermal power plants and motor vehicles to PM_2.5 concentration in 2020. So as to provide recommendations for related standards revisions and PM_2.5 prevention and control in the future.The results showed that implementation of the 2011-version ESTP and ESMV could both effectively reduce the PM_2.5 pollution, when both were implemented, reduction of PM_2.5 concentrations was more obvious. When the 2011-version ESTP was implemented since January 1,2012, the annual average concentration of PM_2.5 in 30 major cites decreased from 32.8～90.6 μg/m3 to 24.3～79.2 μg/m3, the contribution rate of thermal power plants to PM_2.5 pollution in 30 major cites decreased from 27.7%～34.8% to 12.2%～19.6% in 2020 compared to the implementation of the 2003-version ESTP. When ESMV was implemented, the annual average concentration of PM_2.5 in 30 major cites decreased from 32.8～90.6 μg/m3 to 27.5～82.7 μg/m3, the contribution rate of motor vehicle to PM_2.5 pollution in 30 major cites decreased from 23.3%～31.7% to 14.9%～23.9% in 2020 compared to maintaining control intensity of 2010. When the 2011-version ESTP and ESMV was implemented, the annual average concentration of PM_2.5 in 30 major cites decreased from 32.8～90.6 μg/m3 to 19.2～71.4 μg/m3 in 2020 compared to implementation of the 2003-version ESTP and maintaining control intensity of 2010.Research indicated that the implementation of emission standards of air pollutants for thermal power plants and motor vehicle was beneficial to reducing PM_2.5 pollution. However, PM_2.5 pollution is still serious in China by 2020. In order to better control PM_2.5 pollution, more stringent measures are needed to control the emission of air pollution sources, including thermal power plants and motor vehicle.