Construction Of A Method For Assessing The Effectiveness Of Rapid Diagnostic Control Measures For PM 2.5 Sources In The Beijing-Tianjin-Hebei Region

In recent years,China's PM_2.5 pollution is serious,especially in the Beijing-Tianjin-Hebei region,heavy pollution process occurs frequently,accurate analysis of PM_2.5 contribution source is the scientific development of the corresponding control measures an important prerequisite.At present,the source of PM_2.5 at home and abroad analytical methods are different,and each drawbacks.The method based on the air quality model has a large difference from the source analysis results of the chemical monitoring method due to the uncertainty of the emission inventory,and the method of chemical monitoring is also limited by timeliness and can not be output instantaneously as quickly as the air quality model Based on the analysis results of the PM_2.5 observation source in the Beijing-Tianjin-Hebei region,the method of rapid diagnosis of pollution sources and the evaluation of the effectiveness of the control measures is established in this paper,based on the regional air quality model CAMX particle source tracking module PSAT as the core,And the design of the Beijing motor vehicle emission reduction program,after the reduction of PM_2.5 concentration changes and the proportion of industry changes in the study,the research results are as follows:?1?Establish a source analysis method based on air quality numerical model.Using the regional air quality model CAMX particle source identification technology?PSAT?,the regional and industry sources of PM_2.5 concentration in the Beijing-Tianjin-Hebei region were tracked,and the air quality was predicted and the regional and industry sources were contributed.?2?the establishment of observation facts and numerical model simulation fusion source of pollution calculation method.PM_2.5 was divided into primary and secondary components according to the particle properties,respectively,compared with the observed data,and the use of the respective adjustment coefficient to adjust the primary and secondary simulation concentration.At the same time,taking into account the current domestic model to simulate the secondary component of the reaction rate is seriously low,resulting in secondary pollutants generated time scale elongation,exaggerated the contribution of secondary components of the external source,so the use of ammonium salt regional source simulation Contribution ratio,the adjusted second sum is allocated to each region,and thus the contribution of the secondary component concentration in each region under the fusion method.?3?the establishment of control measures to assess the effectiveness of the method.Based on the simulation results of PSAT technique,the response relationship of PM_2.5 precursor emissions to the contribution of the surface concentration was obtained on the basis of the calculation method of the pollution source and the numerical model.The design of a variety of local secondary component concentration distribution scheme and the calculation scheme can obtain the concentration reduction ratio of PM_2.5 and its components under the known industry emission and emission reduction ratio,and can predict The effectiveness of the control measures and rapid assessment.?4?In January 2014,PM_2.5 in Beijing under the fusion method of pollution sources identified and found that: Beijing PM_2.5 once,the second component concentration contribution accounted for 48% and 52%,respectively,of which the second group The contribution rate of the local and field concentration of the total PM_2.5 was 68% and 32% respectively.After the 40% reduction in the local motor vehicle industry in Beijing in January 2014,the local contribution rate was 69% The results showed that the PM_2.5 concentration in Beijing was 54% and 46%,respectively,and the contribution rate of the secondary concentration of the secondary component was 90% The proportion of PM_2.5 in the two kinds of calculation programs is between 1.40% 2.66% and 1.40% 3.20% respectively.In the period of the monthly period,the two kinds of The reduction ratio of the calculation scheme is between 1.90% 2.75% and 1.90% 3.53%.And in the same reduction efforts,all the adjustment program will increase the PM_2.5 concentration reduction ratio.Whether it is monthly or heavy pollution period,in the same reduction efforts,according to the model simulation of the secondary component ratio of the two component concentration distribution,and the motor vehicle industry once the concentration of components do not adjust the adjustment of the calculation Program PM_2.5 cut the effect of the most obvious,but also closer to the observation of the facts.