Beijing recently released a new round of research results on the source resolution of fine particles (PM2.5). Research shows that local emissions from the major sources of PM2.5 in Beijing account for two-thirds of the total and regional transmission accounts for one-third of the city's total annual PM2.5. In 2017, the regional average contribution of PM2.5 at 58 micrograms/m3 contributes approximately 20 micrograms/year. cubic meter. As the pollution level increases, regional transmission contribution increases, and heavy pollution day area transmission accounts for 55%-75%. From the current local atmospheric PM2.5 source characteristics in Beijing, mobile sources account for the largest proportion, up to 45%.
The main conclusions of this study indicate that local emissions from the main sources of PM2.5 in Beijing account for two-thirds of the total in the year. In the current contribution of local emissions, mobile sources, dust sources, industrial sources, living surface sources and coal-fired sources are respectively 45%, 16%, 12%, 12%, and 3%, agriculture and natural resources account for about 12%; mobile vehicles in Beijing have the greatest contribution from mobile sources, and construction and road dust are equally important in dust sources. Industrial sources The contribution made by China's petrochemical industry, automobile industry, and printing industries that emit volatile organic compounds is more prominent, with about 40% of the use of domestic solvents in living sources. Regional transmission accounts for 26%-42%, about one-third, and with the increase of pollution level, the contribution of regional transmission shows a clear upward trend. Moderate pollution day (PM2.5 average daily concentration is 115-150 micrograms/cubic Between the meters, the regional transmission accounts for 34%-50%, and the heavy pollution day (PM2.5 daily average concentration> 150μg/m3) regional transmission accounts for 55%-75%.
The results of source analysis show that the contribution of each major source to the absolute concentration of PM2.5 declines significantly; the local source presents “two liters, two drops, and one highlight”; the regional transmission contribution has increased.
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