Atmospheric ozone chemistry and control strategies in Hangzhou, China: Application of a 0-D box model

Zhao, Yanyun; Gao, Xiang; Li, Kangwei; Han, Lixia; Zhang, Xin; Gao, Xiang; Azzi, Merched; Cen, Kefa

doi:10.1016/j.atmosres.2020.105109

Cited by 21 publications

(4 citation statements)

References 36 publications

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“…Recent analysis of in-situ measurements indicated that alkenes and aromatics were the major reactive VOC groups for O 3 production in urban areas. For example, alkenes were the dominant VOCs in the NCP [37], FWP [34], and SCB [38], while aromatics were more important in the YRD [28,39] and PRD [40]. The importance of aromatics to O 3 formation typically increased along with decreasing latitudes.…”

Section: O 3 Formation Regimementioning

confidence: 99%

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Ground-level ozone pollution in China: a synthesis of recent findings on influencing factors and impacts

Wang

Xue

Zhu

et al. 2022

Environ. Res. Lett.

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Ozone (O3) in the troposphere is an air pollutant and a greenhouse gas. In mainland China, after the Air Pollution Prevention and Action Plan was implemented in 2013 – and despite substantial decreases in the concentrations of other air pollutants – ambient O3 concentrations paradoxically increased in many urban areas. The worsening urban O3 pollution has fuelled numerous studies in recent years, which have enriched knowledge about O3-related processes and their impacts. In this article, we synthesise the key findings of over 500 articles on O3 over mainland China that were published in the past six years in English-language journals. We focus on recent changes in O3 concentrations, their meteorological and chemical drivers, complex O3 responses to the drastic decrease in human activities during coronavirus disease 2019 lockdowns, several emerging chemical processes, impacts on crops and trees, and the latest government interventions.

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Section: O 3 Formation Regimementioning

confidence: 99%

“…These results are generally similar to those obtained from the early studies [3,7], indicating insignificant changes in VOC species that controlled O 3 formation in these regions. Biogenic VOCs play an important role in some occasions [39].…”

Section: O 3 Formation Regimementioning

confidence: 99%

Ground-level ozone pollution in China: a synthesis of recent findings on influencing factors and impacts

Wang

Xue

Zhu

et al. 2022

Environ. Res. Lett.

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“…The cycle between OH and HO 2 is highly pertinent to O 3 formation, influencing the chain reaction propagation ( 40 ). Thus, the levels and reaction routes of free radicals are significant factors in O 3 generation.…”

Section: Resultsmentioning

confidence: 99%

“…Table S10 compares the OH and HO 2 levels for different Chinese cities. The differing levels of free radicals in various studies may be attributed to the different air pollutants and weather conditions at each locale sampled ( 40 ). The peak OH and HO 2 concentrations responded differently at the two sites, highlighting the complex effects of the levels of NO x and VOC reductions on photochemistry ( 23 , 43 ).…”

Section: Resultsmentioning

confidence: 99%

Attributing Increases in Ozone to Accelerated Oxidation of Volatile Organic Compounds at Reduced Nitrogen Oxides Concentrations

Zhang

Jiang

et al. 2022

PNAS Nexus

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Surface ozone (O3) is an important secondary pollutant affecting climate change and air quality in the atmosphere. Observations during the COVID-19 lockdown in urban China show that the co-abatement of nitrogen oxides (NOx) and volatile organic compounds (VOCs) caused winter ground-level O3 increases, but the chemical mechanisms involved are unclear. Here we report field observations in the Shanghai lockdown that reveals increasing photochemical formation of O3 from VOC oxidation with decreasing NOx. Analyses of the VOC profiles and NO/NO2 indicate that the O3 increase by the NOx reduction counteracted the O3 decrease throughthe VOC emission reduction in the VOC-limited region, and this may have been the main mechanism for this net O3 increase. The mechanism may have involved accelerated OH–HO2–RO2 radical cycling. The NOx reductions for increasing O3 production could explain why O3 increased from 2014 to 2020 in response to NOx emission reduction even as VOC emissions have essentially remained unchanged. Model simulations suggest that aggressive VOC abatement, particularly for alkenes and aromatics, should help reverse the long-term O3 increase under current NOx abatement conditions.

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Characteristics of Atmospheric Volatile Organic Compounds and Photochemical Changes During an O3 Event in a County-Level City of Shaanxi Province, China

Zhang¹,

Tan²,

Xu³

et al. 2023

Water Air Soil Pollut

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Atmospheric ozone chemistry and control strategies in Hangzhou, China: Application of a 0-D box model

Cited by 21 publications

References 36 publications

Ground-level ozone pollution in China: a synthesis of recent findings on influencing factors and impacts

Ground-level ozone pollution in China: a synthesis of recent findings on influencing factors and impacts

Attributing Increases in Ozone to Accelerated Oxidation of Volatile Organic Compounds at Reduced Nitrogen Oxides Concentrations

Characteristics of Atmospheric Volatile Organic Compounds and Photochemical Changes During an O3 Event in a County-Level City of Shaanxi Province, China

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