Characteristics, source apportionment and contribution of VOCs to ozone formation in Wuhan, Central China

Hui, Lirong; Liu, Xingang; Tan, Qinwen; Feng, Miao; An, Junling; Yu, Qian; Zhang, Yuanhang; Jiang, Mingming

doi:10.1016/j.atmosenv.2018.08.042

Cited by 265 publications

(120 citation statements)

References 65 publications

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“…All of the above techniques have been validated and applied in many previous studies, and their measurement principles, quality assurance, and control procedures were described in detail (Wang et al, 2015;Hui et al, 2018Hui et al, , 2019Shen et al, 2016;Zhao et al, 2015;Nan et al, 2017).…”

Section: Measurement Site and Techniquesmentioning

confidence: 99%

Observationally constrained modeling of atmospheric oxidation capacity and photochemical reactivity in Shanghai, China

Zhu

Wang

et al. 2020

Atmos. Chem. Phys.

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Abstract. An observation-based model coupled to the Master Chemical Mechanism (V3.3.1) and constrained by a full suite of observations was developed to study atmospheric oxidation capacity (AOC), OH reactivity, OH chain length and HOx (=OH+HO2) budget for three different ozone (O3) concentration levels in Shanghai, China. Five months of observations from 1 May to 30 September 2018 showed that the air quality level is lightly polluted or worse (Ambient Air Quality Index, AQI, of > 100) for 12 d, of which ozone is the primary pollutant for 10 d, indicating ozone pollution was the main air quality challenge in Shanghai during summer of 2018. The levels of ozone and its precursors, as well as meteorological parameters, revealed the significant differences among different ozone levels, indicating that the high level of precursors is the precondition of ozone pollution, and strong radiation is an essential driving force. By increasing the input JNO2 value by 40 %, the simulated O3 level increased by 30 %–40 % correspondingly under the same level of precursors. The simulation results show that AOC, dominated by reactions involving OH radicals during the daytime, has a positive correlation with ozone levels. The reactions with non-methane volatile organic compounds (NMVOCs; 30 %–36 %), carbon monoxide (CO; 26 %–31 %) and nitrogen dioxide (NO2; 21 %–29 %) dominated the OH reactivity under different ozone levels in Shanghai. Among the NMVOCs, alkenes and oxygenated VOCs (OVOCs) played a key role in OH reactivity, defined as the inverse of the OH lifetime. A longer OH chain length was found in clean conditions primarily due to low NO2 in the atmosphere. The high level of radical precursors (e.g., O3, HONO and OVOCs) promotes the production and cycling of HOx, and the daytime HOx primary source shifted from HONO photolysis in the morning to O3 photolysis in the afternoon. For the sinks of radicals, the reaction with NO2 dominated radical termination during the morning rush hour, while the reactions of radical–radical also contributed to the sinks of HOx in the afternoon. Furthermore, the top four species contributing to ozone formation potential (OFP) were HCHO, toluene, ethylene and m/p-xylene. The concentration ratio (∼23 %) of these four species to total NMVOCs is not proportional to their contribution (∼55 %) to OFP, implying that controlling key VOC species emission is more effective than limiting the total concentration of VOC in preventing and controlling ozone pollution.

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Section: Measurement Site and Techniquesmentioning

confidence: 99%

Observationally constrained modeling of atmospheric oxidation capacity and photochemical reactivity in Shanghai, China

Zhu

Wang

et al. 2020

Atmos. Chem. Phys.

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“…Manufacturing industries are the important stationary emission sources of air pollutants worldwide. These emission sources have become one of the major contributors to air pollution due to a substantial increase in industrial production [1][2][3].…”

Section: Introductionmentioning

confidence: 99%

Emission Factor, Relative Ozone Formation Potential and Relative Carcinogenic Risk Assessment of VOCs Emitted from Manufacturing Industries

Yang

Gupta

Dhital

2020

Preprint

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In this study, a few important manufacturing industries located in Central Taiwan were studied (n = 13) for the emission of volatile organic compounds (VOCs), relative ozone formation potential (ROFP) and relative carcinogenic risk (RCR). Higher emission factors of total VOCs (∑VOCs) were observed for stencil printing (423 mg-VOC kg-1) compared to other emission sectors. Alkanes formed the most dominant group of VOCs for steel foundry (41.6%), aluminum foundry (25.1%) and synthetic resin manufacturing (25.0%). However, for the chemical sector (synthetic and polyester resin), oxygenated organics like acetone (55.7%) and ethyl acetate (79.7%) were the predominant VOCs. Moreover, emissions from acrylic resin manufacturing had higher contributions from aromatic compounds (> 95%). Toluene was the topmost compound in terms of its contribution to ∑VOCs in plastic tape manufacturing (44.4%), aluminum foundry (39.6%), steel foundry (11.6%), plastic coating (64.3%) and stencil printing (35.3%). Analysis of ozone formation potentials showed that the metal product & machinery acrylic resin manufacturing and stencil printing had a higher normalized ROFP index and belonged to level-I emission sources. However, in terms of the RCR, integrated iron & steel manufacturing had the highest normalized RCR index belonged to level-I emission sources. Level-I represents the most important VOC emission sources.

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“…1 ) and 35.3% (149 mg-VOC kg -1 ) of ∑VOCs emission factors, respectively. However, methyl methacrylate, ethyl acetate, acetone, methyl ethyl ketone and 2-methyl hexane accounted for a minor fraction of VOCs for both sectors.…”

mentioning

confidence: 98%

Emission factor, relative ozone formation potential and relative carcinogenic risk assessment of VOCs emitted from manufacturing industries

Yang

Gupta

Dhital

2020

Preprint

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Manufacturing industries are one of the important emission sectors of anthropogenic volatile organic compounds (VOCs). In this study, VOC emission factors, relative ozone formation potential (ROFP) and relative carcinogenic risk (RCR) were estimated for some important manufacturing industries (n = 13) located in central Taiwan. Emission samples were collected in stainless steel canisters and were analyzed with a system of gas chromatography-mass spectroscopy. Higher emission factors of total VOCs (∑VOCs) were observed for stencil printing (423 mg-VOC kg-1) compared to other emission industries. Alkanes constituted the most prominent group of VOCs for steel foundry (41.6%), aluminum foundry (25.1%) and synthetic resin industries (25.0%). Oxygenated VOCs were obtained as the most abundant group in the organic solvent (80.3%), polyester resin (80.0%) and PU leather (75.0%) industries. Moreover, emissions from acrylic resin manufacturing had higher contributions from aromatic compounds (> 95%). Toluene was the topmost compound in terms of its contribution to ∑VOCs in plastic tape manufacturing (44.4%), aluminum foundry (39.6%), steel foundry (11.6%), plastic coating (64.3%) and stencil printing (35.3%). Analysis of ozone formation potentials showed that the metal product and machinery acrylic resin manufacturing and stencil printing had a higher normalized ROFP index and belonged to Level-I emission sources. However, in terms of the RCR, integrated iron and steel manufacturing had the highest normalized RCR index belonged to level-I emission sources. Level-I represents the most important VOC emission sources. This study provides a reactivity- and carcinogenicity-based approach to identify high-priority VOC emission sources. The results of this study would help formulate emission reduction policies and strategies for manufacturing industries.

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Characteristics, source apportionment and contribution of VOCs to ozone formation in Wuhan, Central China

Cited by 265 publications

References 65 publications

Observationally constrained modeling of atmospheric oxidation capacity and photochemical reactivity in Shanghai, China

Observationally constrained modeling of atmospheric oxidation capacity and photochemical reactivity in Shanghai, China

Emission Factor, Relative Ozone Formation Potential and Relative Carcinogenic Risk Assessment of VOCs Emitted from Manufacturing Industries

Emission factor, relative ozone formation potential and relative carcinogenic risk assessment of VOCs emitted from manufacturing industries

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