Causes of ozone pollution in summer in Wuhan, Central China

P. Zeng; X. P. Lyu; Hai Guo; H. R. Cheng; F. Jiang; W. Z. Pan; Z. W. Wang; S. W. Liang; Y. Q. Hu

doi:10.1016/j.envpol.2018.05.042

Causes of ozone pollution in summer in Wuhan, Central China

P. Zeng, X. P. Lyu, Hai Guo^*, H. R. Cheng^*, F. Jiang, W. Z. Pan, Z. W. Wang, S. W. Liang, Y. Q. Hu

^*Corresponding author for this work

Research output: Contribution to journal › Journal article › peer-review

86 Citations (Scopus)

Abstract

In August 2016, continuous measurements of volatile organic compounds (VOCs) and trace gases were conducted at an urban site in Wuhan. Four high-ozone (O₃) days and twenty-seven non-high-O₃ days were identified according to the China's National Standard Level II (∼100 ppbv). The occurrence of high-O₃ days was accompanied by tropical cyclones. Much higher concentrations of VOCs and carbon monoxide (CO) were observed on the high-O₃ days (p < 0.01). Model simulations revealed that vehicle exhausts were the dominant sources of VOCs, contributing 45.4 ± 5.2% and 37.3 ± 2.9% during high-O₃ and non-high-O₃ days, respectively. Both vehicle exhausts and stationary combustion made significantly larger contributions to O₃ production on high-O₃ days (p < 0.01). Analysis using a chemical transport model found that local photochemical formation accounted for 74.7 ± 5.8% of the daytime O₃, around twice the regional transport (32.2 ± 5.4%), while the nighttime O₃ was mainly attributable to regional transport (59.1 ± 9.9%). The local O₃ formation was generally limited by VOCs in urban Wuhan. To effectively control O₃ pollution, the reduction ratio of VOCs to NO_x concentrations should not be lower than 0.73, and the most efficient O₃ abatement could be achieved by reducing VOCs from vehicle exhausts. This study contributes to the worldwide database of O₃-VOC-NO_x sensitivity research. Its findings will be helpful in formulating and implementing emission control strategies for dealing with O₃ pollution in Wuhan.

Original language	English
Pages (from-to)	852-861
Number of pages	10
Journal	Environmental Pollution
Volume	241
Early online date	15 Jun 2018
DOIs	https://doi.org/10.1016/j.envpol.2018.05.042
Publication status	Published - Oct 2018

Scopus Subject Areas

Toxicology
Pollution
Health, Toxicology and Mutagenesis

User-Defined Keywords

VOCs
Source apportionment
O3 formation
Vehicle exhausts
Control measures

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1016/j.envpol.2018.05.042

Cite this

@article{1b49014db2ba4677830d9bdad7a5a007,

title = "Causes of ozone pollution in summer in Wuhan, Central China",

abstract = "In August 2016, continuous measurements of volatile organic compounds (VOCs) and trace gases were conducted at an urban site in Wuhan. Four high-ozone (O3) days and twenty-seven non-high-O3 days were identified according to the China's National Standard Level II (∼100 ppbv). The occurrence of high-O3 days was accompanied by tropical cyclones. Much higher concentrations of VOCs and carbon monoxide (CO) were observed on the high-O3 days (p < 0.01). Model simulations revealed that vehicle exhausts were the dominant sources of VOCs, contributing 45.4 ± 5.2% and 37.3 ± 2.9% during high-O3 and non-high-O3 days, respectively. Both vehicle exhausts and stationary combustion made significantly larger contributions to O3 production on high-O3 days (p < 0.01). Analysis using a chemical transport model found that local photochemical formation accounted for 74.7 ± 5.8% of the daytime O3, around twice the regional transport (32.2 ± 5.4%), while the nighttime O3 was mainly attributable to regional transport (59.1 ± 9.9%). The local O3 formation was generally limited by VOCs in urban Wuhan. To effectively control O3 pollution, the reduction ratio of VOCs to NOx concentrations should not be lower than 0.73, and the most efficient O3 abatement could be achieved by reducing VOCs from vehicle exhausts. This study contributes to the worldwide database of O3-VOC-NOx sensitivity research. Its findings will be helpful in formulating and implementing emission control strategies for dealing with O3 pollution in Wuhan.",

keywords = "VOCs, Source apportionment, O3 formation, Vehicle exhausts, Control measures",

author = "P. Zeng and Lyu, {X. P.} and Hai Guo and Cheng, {H. R.} and F. Jiang and Pan, {W. Z.} and Wang, {Z. W.} and Liang, {S. W.} and Hu, {Y. Q.}",

note = "Funding Information: This study was supported by the National Key R&D Program of China via grant No. 2017YFC0212001 , the Wuhan Environmental Monitoring Center via grant No. 250000975 , and The Hong Kong Polytechnic University joint supervision scheme with the Chinese mainland, Taiwan and Macao Universities (project No: G-SB63 ). We are grateful to the Research Grants Council of Hong Kong for its financial support via grants CRF/C5004-15E, PolyU152052/14E, PolyU152052/16E, and CRF/C5022-14G. Publisher Copyright: {\textcopyright} 2018 Elsevier Ltd",

year = "2018",

month = oct,

doi = "10.1016/j.envpol.2018.05.042",

language = "English",

volume = "241",

pages = "852--861",

journal = "Environmental Pollution",

issn = "0269-7491",

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T1 - Causes of ozone pollution in summer in Wuhan, Central China

AU - Zeng, P.

AU - Lyu, X. P.

AU - Guo, Hai

AU - Cheng, H. R.

AU - Jiang, F.

AU - Pan, W. Z.

AU - Wang, Z. W.

AU - Liang, S. W.

AU - Hu, Y. Q.

N1 - Funding Information: This study was supported by the National Key R&D Program of China via grant No. 2017YFC0212001 , the Wuhan Environmental Monitoring Center via grant No. 250000975 , and The Hong Kong Polytechnic University joint supervision scheme with the Chinese mainland, Taiwan and Macao Universities (project No: G-SB63 ). We are grateful to the Research Grants Council of Hong Kong for its financial support via grants CRF/C5004-15E, PolyU152052/14E, PolyU152052/16E, and CRF/C5022-14G. Publisher Copyright: © 2018 Elsevier Ltd

PY - 2018/10

Y1 - 2018/10

N2 - In August 2016, continuous measurements of volatile organic compounds (VOCs) and trace gases were conducted at an urban site in Wuhan. Four high-ozone (O3) days and twenty-seven non-high-O3 days were identified according to the China's National Standard Level II (∼100 ppbv). The occurrence of high-O3 days was accompanied by tropical cyclones. Much higher concentrations of VOCs and carbon monoxide (CO) were observed on the high-O3 days (p < 0.01). Model simulations revealed that vehicle exhausts were the dominant sources of VOCs, contributing 45.4 ± 5.2% and 37.3 ± 2.9% during high-O3 and non-high-O3 days, respectively. Both vehicle exhausts and stationary combustion made significantly larger contributions to O3 production on high-O3 days (p < 0.01). Analysis using a chemical transport model found that local photochemical formation accounted for 74.7 ± 5.8% of the daytime O3, around twice the regional transport (32.2 ± 5.4%), while the nighttime O3 was mainly attributable to regional transport (59.1 ± 9.9%). The local O3 formation was generally limited by VOCs in urban Wuhan. To effectively control O3 pollution, the reduction ratio of VOCs to NOx concentrations should not be lower than 0.73, and the most efficient O3 abatement could be achieved by reducing VOCs from vehicle exhausts. This study contributes to the worldwide database of O3-VOC-NOx sensitivity research. Its findings will be helpful in formulating and implementing emission control strategies for dealing with O3 pollution in Wuhan.

AB - In August 2016, continuous measurements of volatile organic compounds (VOCs) and trace gases were conducted at an urban site in Wuhan. Four high-ozone (O3) days and twenty-seven non-high-O3 days were identified according to the China's National Standard Level II (∼100 ppbv). The occurrence of high-O3 days was accompanied by tropical cyclones. Much higher concentrations of VOCs and carbon monoxide (CO) were observed on the high-O3 days (p < 0.01). Model simulations revealed that vehicle exhausts were the dominant sources of VOCs, contributing 45.4 ± 5.2% and 37.3 ± 2.9% during high-O3 and non-high-O3 days, respectively. Both vehicle exhausts and stationary combustion made significantly larger contributions to O3 production on high-O3 days (p < 0.01). Analysis using a chemical transport model found that local photochemical formation accounted for 74.7 ± 5.8% of the daytime O3, around twice the regional transport (32.2 ± 5.4%), while the nighttime O3 was mainly attributable to regional transport (59.1 ± 9.9%). The local O3 formation was generally limited by VOCs in urban Wuhan. To effectively control O3 pollution, the reduction ratio of VOCs to NOx concentrations should not be lower than 0.73, and the most efficient O3 abatement could be achieved by reducing VOCs from vehicle exhausts. This study contributes to the worldwide database of O3-VOC-NOx sensitivity research. Its findings will be helpful in formulating and implementing emission control strategies for dealing with O3 pollution in Wuhan.

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KW - Source apportionment

KW - O3 formation

KW - Vehicle exhausts

KW - Control measures

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DO - 10.1016/j.envpol.2018.05.042

M3 - Journal article

C2 - 29913412

AN - SCOPUS:85049314595

SN - 0269-7491

VL - 241

SP - 852

EP - 861

JO - Environmental Pollution

JF - Environmental Pollution

ER -

Causes of ozone pollution in summer in Wuhan, Central China

Abstract

Scopus Subject Areas

User-Defined Keywords

UN SDGs

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