Beijing, 14 May (Reporter He Yong) On the 14th, Beijing released a new round of the latest research results on the source analysis of fine particulate matter (PM2.5). The research shows that local emission accounts for 2/3 and regional transmission accounts for 1/3 of the main sources of PM2.5 in Beijing. Among the local emission contributions, mobile sources, dust sources, industrial sources, living surface sources and coal-fired sources account for 45%, 16%, 12%, 12% and 3% respectively, and others such as agriculture and natural sources account for about 12%. This also means that the share of coal-fired sources has dropped from 22.4% in the last round of source analysis to 3%, which has basically withdrawn from the ranks of major contributors, marking that Beijing’s energy clean strategy has achieved important results. At the same time, the proportion of mobile sources in local emissions has increased significantly. In this research, the proportion of mobile sources from local sources is as high as 45%, which is 1.4 times that of the previous analysis (accounting for 31.1%).
In recent years, Beijing has adhered to the clean energy strategy, vigorously promoted the reduction of coal burning in industry and life, and strived to build a clean energy system with electricity and natural gas as the mainstay, supplemented by geothermal energy and solar energy. On the one hand, four gas-fired thermal power centers have been built one after another, and coal-fired boilers with 10 tons or less in the whole city and 35 tons or less in the built-up area have been basically eliminated, realizing that there is basically no coal in the industrial field. On the other hand, efforts should be made to control loose coal, and "coal to electricity" and "coal to gas" should be vigorously implemented. On the basis of realizing the basic "no coalification" in the core area in 2015, the basic "no coalification" in Chengliu District and the southern plain area will be realized in 2017. The total coal consumption in the city decreased from 23 million tons in 2012 to less than 6 million tons in 2017.
According to the results of a new round of source analysis, mobile sources are the largest source of local atmospheric PM2.5 in Beijing in different time periods and spatial ranges throughout the year, among which diesel vehicles driving in Beijing contribute the most.
Experts put forward three suggestions: First, according to the characteristics of Beijing pollution "two liters, two drops and one highlight (the contribution rate of mobile sources and dust sources increases, the contribution rate of coal and industrial sources decreases, and the contribution rate of domestic non-point sources is further highlighted), strengthen the management of mobile sources (especially diesel vehicles), dust and domestic non-point sources; Second, continue to deepen regional joint prevention and control work, focus on key time periods and key transmission channels, optimize industrial layout, and strengthen emergency linkage during heavy pollution; The third is to continuously strengthen scientific and technological support and improve the ability of scientific and technological pollution control and precise pollution control.