Joint source apportionment method for VOCs and PM2.5 in complex atmospheric pollution

Abstract

The present invention discloses a method for treating VOCs and PM2.5 in atmospheric composite pollution. 2.5 Combined source apportionment method, including: obtaining VOCs species concentration in the atmosphere, PM 2.5 Total concentration and PM 2.5 Component concentration; calculate SOA concentration, determine SOA and PM after deducting SOA 2.5 The remaining part accounts for PM 2.5 The proportion of total concentration; 2.5 The remaining part is source parsed to obtain PM 2.5 The pollution sources and contribution rates of the remaining part; calculate the SOAP concentration, and select multiple VOCs species with higher SOAP concentration for source analysis to obtain the pollution sources and contribution rates of VOCs; calculate PM 2.5 The remaining pollution sources correspond to the PM 2.5 The overall contribution rate; calculate the contribution of each pollution source corresponding to VOCs in PM 2.5 Overall contribution rate; integrated PM 2.5 The remaining part corresponds to the various pollution sources and their sources in PM 2.5 The overall contribution rate and the pollution sources corresponding to VOCs and their contribution to PM 2.5 The overall contribution rate is used to obtain PM2.5 including VOCs pollution sources. 2.5 Pollution sources and contribution rates. The method of the present invention can achieve PM2.5 pollution sources including VOCs pollution sources. 2.5 Analysis of pollution sources.

Description

Technical Field

[0001] The present invention relates to the field of environmental monitoring technology, in particular to a method for detecting VOCs and PM2.5 in atmospheric composite pollution. 2.5 Joint source apportionment approach. Background Art

[0002] In recent years, atmospheric fine particulate matter (PM 2.5 ) pollution problem is becoming increasingly prominent and has become the main air pollution problem faced by urban areas. 2.5 ) refers to particles in the ambient air with an aerodynamic equivalent diameter of less than or equal to 2.5 microns. They can remain suspended in the air for a long time. The higher the concentration of particles in the air, the more serious the air pollution.

[0003] In order to prevent and control air pollution in a targeted manner, it is necessary to analyze and determine the PM 2.5 The source of pollution. 2.5 Source attribution techniques mainly include: source inventory method, air quality model method and receptor model method. The receptor model method determines the composition of pollutants through chemical and microscopic analysis of receptor samples, ultimately identifying the pollution sources that contribute to the receptors and quantitatively calculating the contribution rate of each pollution source. Because the receptor model method is driven by real receptor data, it does not require a source inventory, does not need to track the transmission process of particulate matter, and does not rely on emission conditions, topography, meteorological data, etc. of the emission source. It can effectively avoid many difficulties encountered by source inventory and air quality model methods. Therefore, it is currently the most studied and widely used pollution source attribution technology in actual work. Among them, commonly used receptor model methods include chemical mass balance model method (CMB), positive matrix factorization model method (PMF), etc.

[0004] Since volatile organic compounds (VOCs) are secondary PM 2.5 A precursor of PM 2.5 The pollution sources of VOCs should be considered when analyzing the pollution sources of VOCs. However, the existing receptor model method can only achieve PM 2.5 The pollution source analysis of VOCs or the pollution source analysis of PM2.5 including VOCs pollution sources cannot be achieved. 2.5 The identification of pollution sources leads to relatively low accuracy in source analysis, which makes it difficult to meet the needs of environmental protection and management, and the analysis results are difficult to carry out targeted management and control. Summary of the Invention

[0005] In order to solve some or all of the technical problems existing in the above-mentioned prior art, the present invention provides a method for treating VOCs and PM2.5 in atmospheric composite pollution.2.5 Combined source apportionment method, using secondary organic aerosol (SOA) as the link, using PM 2.5 Source analysis is combined with VOCs source analysis technology to achieve PM2.5 including VOCs pollution sources. 2.5 Identification of pollution sources.

[0006] The technical solutions of the present invention are as follows:

[0007] Provides a method for VOCs and PM2.5 in atmospheric composite pollution 2.5 A joint source analysis method, the method comprising:

[0008] Obtain VOCs species concentration and PM in the atmosphere 2.5 Total concentration and PM 2.5 Component concentration;

[0009] According to PM 2.5 Calculate SOA concentration from component concentration and determine the proportion of SOA in PM 2.5 The proportion of total concentration and PM after deducting SOA 2.5 The remaining part accounts for PM 2.5 The proportion of total concentration;

[0010] PM after deducting SOA 2.5 The remaining part is source parsed to obtain PM 2.5 The pollution sources and contribution rates of the remaining part;

[0011] Calculate the corresponding SOAP concentration based on the VOCs species concentration, and select multiple VOCs species with higher SOAP concentrations for source analysis to obtain the pollution sources and contribution rates of VOCs;

[0012] According to PM 2.5 The remaining part accounts for PM 2.5 The proportion of total concentration, PM 2.5 The remaining pollution sources and contribution rates are used to calculate PM 2.5 The remaining pollution sources correspond to the PM 2.5 Overall contribution rate;

[0013] According to SOA, PM 2.5 The proportion of total concentration, pollution sources and contribution rates of VOCs, and calculation of the pollution sources corresponding to VOCs in PM 2.5 Overall contribution rate;

[0014] Integrated PM 2.5 The remaining part corresponds to the various pollution sources and their sources in PM 2.5 The overall contribution rate and the pollution sources corresponding to VOCs and their contribution to PM 2.5 Overall contribution rate, combined PM2.5 The remaining pollution sources are the same as those of VOCs in PM 2.5 The overall contribution rate is used to obtain PM2.5 including VOCs pollution sources. 2.5 Pollution sources and contribution rates.

[0015] In some possible implementations, according to PM 2.5 The SOA concentration was calculated using the following formula:

[0016] [SOA] = k[SOC]

[0017] Where [SOA] represents the SOA concentration, k represents the preset empirical coefficient, and [SOC] represents the secondary organic carbon concentration.

[0018] In some possible implementations, the secondary organic carbon concentration is calculated using the following formula:

[0019] [SOC]=[OC]-[EC]×([OC] / [EC]) min

[0020] Where [OC] represents PM 2.5 Organic carbon concentration in PM 2.5 Inorganic carbon concentration in ([OC] / [EC]) min Indicates the minimum value of the ratio of [OC] to [EC].

[0021] In some possible implementations, the preset empirical coefficient k is 1.2 to 1.6, preferably 1.4.

[0022] In some possible implementations, the PM after deducting SOA is decomposed using a positive definite matrix factorization model. 2.5 The remaining parts are source parsed.

[0023] In some possible implementations, for any VOCs species, the SOAP concentration corresponding to the VOCs species is calculated using the following formula based on the VOCs species concentration:

[0024] [SOAP]=[VOCs0]×FAC

[0025]

[0026] Among them, [SOAP] represents the SOAP concentration corresponding to the VOCs species, [VOCs0] represents the initial concentration of the VOCs species before oxidation, FAC represents the formation coefficient of secondary organic aerosol, [VOCs t ] represents the concentration of VOCs species in the atmosphere, F vpcr Indicates the fraction of VOCs species participating in the reaction.

[0027] In some possible implementations, the top 20 to 40 VOCs species with higher SOAP concentrations are selected for source analysis.

[0028] In some possible implementations, a positive definite matrix factorization model method is used to perform source analysis on multiple selected VOCs species.

[0029] In some possible implementations, PM 2.5 The remaining part corresponds to the pollution source in PM 2.5 The overall contribution rate is equal to the corresponding PM 2.5 The remaining pollution source contribution rate is multiplied by PM 2.5 The remaining part accounts for PM 2.5 The proportion of the total concentration.

[0030] In some possible implementations, the pollution sources corresponding to VOCs are in PM 2.5 The overall contribution rate is equal to the corresponding VOCs pollution source contribution rate multiplied by the SOA proportion of PM 2.5 The proportion of the total concentration.

[0031] The main advantages of the technical solution of the present invention are as follows:

[0032] VOCs and PM in the atmospheric composite pollution of the present invention 2.5 The joint source resolution method uses SOA as a link to identify PM 2.5 When considering the pollution sources of VOCs, the pollution sources of VOCs can be considered to achieve PM2.5 including VOCs pollution sources. 2.5 Pollution source analysis, with high source analysis accuracy, the corresponding analysis results can fully meet the needs of environmental protection and management, and achieve more detailed pollution source control. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The drawings described herein are used to provide a further understanding of the embodiments of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0034] Figure 1 VOCs and PM in the atmospheric composite pollution of one embodiment of the present invention 2.5 Flowchart of the joint source apportionment method;

[0035] Figure 2 VOCs and PM in the atmospheric composite pollution of one embodiment of the present invention 2.5 PM in the joint source apportionment method 2.5 Schematic diagram of the source calculation process. DETAILED DESCRIPTION

[0036] To make the objectives, technical solutions, and advantages of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below in conjunction with specific embodiments of the present invention and corresponding drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0037] The technical solutions provided by the embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0038] refer to Figure 1-2 One embodiment of the present invention provides a method for treating VOCs and PM2.5 in atmospheric composite pollution. 2.5 The joint source analysis method includes the following steps S1-S7:

[0039] Step S1: Obtain the concentration of VOCs species and PM in the atmosphere 2.5 Total concentration and PM 2.5 Component concentration;

[0040] In one embodiment of the present invention, a monitoring instrument is used to collect the concentration of VOCs species and PM 2.5 Total concentration and PM 2.5 Component concentration, obtain corresponding data.

[0041] The sampling period and each sampling moment can be set according to actual needs.

[0042] Specifically, beta attenuation particle counters can be used to measure PM 2.5 Total concentration, measured by X-ray fluorescence PM 2.5 The key components (Ca, K, Pb, Cr, Cd, Zn, Cu, Ni, Fe, Mn, Ti, etc.) in PM were determined by ion chromatography. 2.5 Water-soluble ions (Na + , K + , Mg 2+ , Ca 2+ , Cl - , F - , NO3 - , SO4 2- and NH4 + ), using a semi-continuous thermal optical carbon analyzer to determine PM 2.5 Organic carbon (OC) and inorganic carbon (EC) in the soil.

[0043] In one embodiment of the present invention, a VOCs online monitor can be used to measure the concentration of VOCs species. VOCs include 117 species, including: ethylene, acetylene, ethane, propylene, propane, isobutane, 1-butene, n-butane, cis-2-butene, trans-2-butene, isopentane, 1-pentene, n-pentane, trans-2-pentene, isoprene, cis-2-pentene, 2,2-dimethylbutane, cyclopentane, 2,3-dimethylbutane, 2-methylpentane, 3-methylpentane, 1-hexene, n-hexane, 2,4-dimethylpentane, methylcyclopentane, benzene, cyclohexane alkane, 2-methylhexane, 2,3-dimethylpentane, 3-methylhexane, 2,2,4-trimethylpentane, n-heptane, methylcyclohexane, 2,3,4-trimethylpentane, 2-methylheptane, toluene, 3-methylheptane, n-octane, m / p-xylene, ethylbenzene, m-xylene, n-nonane, styrene, o-xylene, isopropylbenzene, n-propylbenzene, o-ethyltoluene, m-ethyltoluene, 1,3,5-trimethylbenzene, p-ethyltoluene, n-decane, 1,2,4-trimethylbenzene, 1,2,3-trimethylbenzene, m-diethylbenzene, p-diethylbenzene, n-undecane, n- Dodecane, formaldehyde, acetaldehyde, acrolein, acetone, propionaldehyde, crotonaldehyde, isopropylamine, 2-butanone, n-butyraldehyde, benzaldehyde, valeraldehyde, 3-methylbenzaldehyde, hexanal, Freon-12, methyl chloride, Freon-114, vinyl chloride, 1,3-butadiene, methyl bromide, ethyl chloride, Freon-11, 1,1-dichloroethylene, Freon-113, carbon disulfide, dichloromethane, isopropyl alcohol, cis-1,2-dichloroethylene, methyl tert-butyl ether, 1,1-dichloroethane, vinyl acetate, trans-1,2-dichloroethylene, ethyl acetate, chloroform, tetrahydrofuran, 1,1 ,1-trichloroethane, 1,2-dichloroethane, carbon tetrachloride, trichloroethylene, 1,2-dichloropropane, methyl methacrylate, 1,4-dioxane, bromodichloromethane, cis-1,3-dichloropropene, 4-methyl-2-pentanone, trans-1,3-dichloropropene, 1,1,2-trichloroethane, 2-hexanone, dibromochloromethane, tetrachloroethylene, 1,2-dibromoethane, chlorobenzene, bromoform, 1,1,2,2-tetrachloroethane, 1,3-dichlorobenzene, chlorotoluene, 1,4-dichlorobenzene, 1,2-dichlorobenzene, 1,2,4-trichlorobenzene, naphthalene, hexachlorobutadiene.

[0044] Step S2, according to PM 2.5 Calculate SOA concentration from component concentration and determine the proportion of SOA in PM 2.5 The proportion of total concentration and PM after deducting SOA 2.5 The remaining part accounts for PM 2.5 The proportion of total concentration;

[0045] In one embodiment of the present invention, according to PM 2.5 The SOA concentration was calculated using the following formula:

[0046] [SOA] = k[SOC]

[0047] Where [SOA] represents the SOA concentration, k represents the preset empirical coefficient, and [SOC] represents the secondary organic carbon concentration.

[0048] Furthermore, in one embodiment of the present invention, the secondary organic carbon concentration [SOC] is calculated using the following formula:

[0049] [SOC]=[OC]-[EC]×([OC] / [EC]) min

[0050] Where [OC] represents PM 2.5 Organic carbon concentration in PM 2.5 Inorganic carbon concentration in ([OC] / [EC]) min Indicates the minimum value of the ratio of [OC] to [EC] in the current sampling period.

[0051] Furthermore, in one embodiment of the present invention, the preset empirical coefficient k is given according to past experience, and may be, for example, 1.2 to 1.6, preferably 1.4.

[0052] Step S3, PM after deducting SOA 2.5 The remaining part is source parsed to obtain PM 2.5 The pollution sources and contribution rates of the remaining part;

[0053] In one embodiment of the present invention, the existing positive definite matrix factorization model method can be used to decompose the PM after deducting SOA. 2.5 The remaining part is source parsed to obtain PM 2.5 The pollution sources and contribution rates of the remaining part.

[0054] Step S4: Calculate the corresponding SOAP (Secondary Organic Aerosol Generation Potential) concentration based on the VOC species concentration, and select multiple VOC species with higher SOAP concentrations for source analysis to obtain the pollution sources and contribution rates of the VOCs;

[0055] In one embodiment of the present invention, for any VOCs species, the SOAP concentration corresponding to the VOCs species is calculated using the following formula based on the VOCs species concentration:

[0056] [SOAP]=[VOCs0]×FAC

[0057]

[0058] Where [SOAP] represents the SOAP concentration corresponding to the VOCs species, in μg / m3 , [VOCs0] represents the initial concentration of VOCs species before oxidation, in μg / m 3 , FAC represents the formation coefficient of secondary organic aerosol, [VOCs t ] represents the concentration of VOCs species after oxidation, that is, the concentration of VOCs species in the atmosphere measured by a VOCs online monitor, in μg / m 3 , F vocr Indicates the fraction of VOCs species participating in the reaction.

[0059] In one embodiment of the present invention, the secondary organic aerosol generation coefficient FAC corresponding to the VOCs species and the fraction F of the VOCs species participating in the reaction are vocr The values ​​of can be referred to the following table or obtained from other scientific studies. The secondary organic aerosol generation coefficient FAC and the fraction F of VOCs species participating in the reaction corresponding to the VOCs species not listed in the table are vocr The value can be set to 0.

[0060] Table 1 (FAC and F vocr Numerical table)

[0061]

[0062]

[0063] Furthermore, in one embodiment of the present invention, the existing positive definite matrix factorization model method can be used to perform source analysis on the selected multiple VOCs species to obtain the pollution sources and contribution rates of the VOCs.

[0064] Among them, the top 20 to 40 VOCs species with higher SOAP concentrations can be selected for source analysis, for example, the top 20 VOCs species for source analysis, the top 25 VOCs species for source analysis, the top 30 VOCs species for source analysis, or the top 40 VOCs species for source analysis.

[0065] Step S5, according to PM 2.5 The remaining part accounts for PM 2.5 The proportion of total concentration, PM 2.5 The remaining pollution sources and contribution rates are used to calculate PM 2.5 The remaining pollution sources correspond to the PM 2.5 Overall contribution rate;

[0066] In one embodiment of the present invention, PM 2.5 The remaining part corresponds to the pollution source in PM 2.5 The overall contribution rate is equal to the corresponding PM 2.5The remaining pollution source contribution rate is multiplied by PM 2.5 The remaining part accounts for PM 2.5 The proportion of the total concentration.

[0067] For example, PM 2.5 The remaining part accounts for PM 2.5 The proportion of total concentration is 80%, PM 2.5 If the contribution rate of a pollution source is 20% among the remaining pollution sources, then PM 2.5 The remaining part corresponds to the pollution source in PM 2.5 The overall contribution rate is 20%×80%=16%.

[0068] Step S6: Based on the percentage of SOA in PM 2.5 The proportion of total concentration, pollution sources and contribution rates of VOCs, and calculation of the pollution sources corresponding to VOCs in PM 2.5 Overall contribution rate;

[0069] In one embodiment of the present invention, the pollution source corresponding to VOCs is PM 2.5 The overall contribution rate is equal to the corresponding VOCs pollution source contribution rate multiplied by the SOA proportion of PM 2.5 The proportion of the total concentration.

[0070] For example, SOA accounts for PM 2.5 The proportion of total concentration is 20%, and the contribution rate of a certain pollution source in the VOCs pollution source is 25%. Then the pollution source corresponding to VOCs in PM 2.5 The overall contribution rate is 25%×20%=5%.

[0071] Step S7, integrate PM 2.5 The remaining part corresponds to the various pollution sources and their sources in PM 2.5 The overall contribution rate and the pollution sources corresponding to VOCs and their contribution to PM 2.5 Overall contribution rate, combined PM 2.5 The remaining pollution sources are the same as those of VOCs in PM 2.5 The overall contribution rate is used to obtain PM2.5 including VOCs pollution sources. 2.5 Pollution sources and contribution rates.

[0072] Specifically, PM 2.5 The remaining part corresponds to the various pollution sources and their sources in PM 2.5 The overall contribution rate and the pollution sources corresponding to VOCs and their contribution to PM 2.5 The overall contribution rate is integrated to determine the PM 2.5Do the pollution sources corresponding to the remaining parts have the same pollution sources as the pollution sources corresponding to VOCs? If so, PM 2.5 The remaining pollution sources are the same as those of VOCs in PM 2.5 The contribution rate of the pollution source in PM is combined to obtain the contribution rate of the pollution source in PM. 2.5 The overall contribution rate; at the same time, for PM 2.5 If the pollution sources of the remaining part and VOCs are different, then keep the corresponding pollution sources in PM 2.5 The overall contribution rate remains unchanged, and the PM including VOCs pollution sources is obtained 2.5 All pollution sources and their contribution rates.

[0073] VOCs and PM in atmospheric composite pollution provided by one embodiment of the present invention 2.5 The joint source resolution method uses SOA as a link to identify PM 2.5 When considering the pollution sources of VOCs, the pollution sources of VOCs can be considered to achieve PM2.5 including VOCs pollution sources. 2.5 Pollution source analysis, with high source analysis accuracy, the corresponding analysis results can fully meet the needs of environmental protection and management, and achieve more detailed pollution source control.

[0074] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In addition, "front", "back", "left", "right", "upper" and "lower" in this document are all referenced to the placement states shown in the accompanying drawings.

[0075] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. VOCs and PM in a complex atmospheric pollution 2.5 The joint source analysis method is characterized by: include: Obtain VOCs species concentration and PM in the atmosphere 2.5 Total concentration and PM 2.5 Component concentration; According to PM 2.5 Calculate SOA concentration from component concentration and determine the proportion of SOA in PM 2.5 The proportion of total concentration and PM after deducting SOA 2.5 The remaining part accounts for PM 2.5 The proportion of total concentration; PM after deducting SOA 2.5 The remaining part is source parsed to obtain PM 2.5 The pollution sources and contribution rates of the remaining part; Calculate the corresponding SOAP concentration based on the VOCs species concentration, and select multiple VOCs species with higher SOAP concentrations for source analysis to obtain the pollution sources and contribution rates of VOCs; According to PM 2.5 The remaining part accounts for PM 2.5 The proportion of total concentration, PM 2.5 The remaining pollution sources and contribution rates are used to calculate PM 2.5 The remaining pollution sources correspond to the PM 2.5 Overall contribution rate; According to SOA PM 2.5 The proportion of total concentration, pollution sources and contribution rates of VOCs, and calculation of the pollution sources corresponding to VOCs in PM 2.5 Overall contribution rate; Integrated PM 2.5 The remaining part corresponds to the various pollution sources and their sources in PM 2.5 The overall contribution rate and the pollution sources corresponding to VOCs and their contribution to PM 2.5 Overall contribution rate, combined PM 2.5 The remaining pollution sources are the same as those of VOCs in PM 2.5 The overall contribution rate is used to obtain PM2.5 including VOCs pollution sources. 2.5 Pollution sources and contribution rates.

2. VOCs and PM in the atmospheric composite pollution according to claim 1 2.5 The joint source analysis method is characterized by: According to PM 2.5 The SOA concentration was calculated using the following formula: ； in, represents the SOA concentration, Indicates the preset empirical coefficient, Represents the secondary organic carbon concentration.

3. VOCs and PM in the atmospheric composite pollution according to claim 2 2.5 The joint source analysis method is characterized by: The secondary organic carbon concentration was calculated using the following formula: ； in, Indicates PM 2.5 The organic carbon concentration in Indicates PM 2.5 The inorganic carbon concentration in express and The minimum value of the ratio.

4. VOCs and PM in the atmospheric composite pollution according to claim 2 or 3 2.5 The joint source analysis method is characterized by: Preset empirical coefficient It is 1.2~1.

6.

5. VOCs and PM in the atmospheric composite pollution according to claim 2 or 3 2.5 The joint source analysis method is characterized by: Preset empirical coefficient is 1.

4.

6. VOCs and PM in the atmospheric composite pollution according to claim 1 2.5 The joint source analysis method is characterized by: The PM after deducting SOA is analyzed using the positive definite matrix factorization model method. 2.5 The remaining parts are source parsed.

7. VOCs and PM in the atmospheric composite pollution according to claim 1 2.5 The joint source analysis method is characterized by: For any VOCs species, the SOAP concentration corresponding to the VOCs species is calculated using the following formula based on the VOCs species concentration: ； ； in, Indicates the SOAP concentration corresponding to the VOCs species, represents the initial concentration of VOCs species before oxidation, represents the generation coefficient of secondary organic aerosol, Indicates the concentration of VOCs species in the atmosphere, Indicates the fraction of VOCs species participating in the reaction.

8. VOCs and PM in the atmospheric composite pollution according to claim 1 2.5 The joint source analysis method is characterized by: The top 20 to 40 VOCs species with higher SOAP concentrations were selected for source analysis.

9. VOCs and PM in the atmospheric composite pollution according to claim 1 2.5 The joint source analysis method is characterized by: The positive definite matrix factorization model method was used to analyze the sources of various selected VOCs species.

10. VOCs and PM in the atmospheric composite pollution according to claim 1 2.5 The joint source analysis method is characterized by: PM 2.5 The remaining part corresponds to the pollution source in PM 2.5 The overall contribution rate is equal to the corresponding PM 2.5 The remaining pollution source contribution rate is multiplied by PM 2.5 The remaining part accounts for PM 2.5 The proportion of the total concentration.

11. VOCs and PM in the atmospheric composite pollution according to claim 1 2.5 The joint source analysis method is characterized by: The pollution sources corresponding to VOCs are PM 2.5 The overall contribution rate is equal to the corresponding VOCs pollution source contribution rate multiplied by the SOA proportion of PM 2.5 The proportion of the total concentration.

Images