Characteristics of volatile organic compounds and their role in ground-level ozone formation in the Beijing-Tianjin-Hebei region, China

Li, Lingyu; Xie, Shaodong; Zeng, Limin; Wu, Rongrong; Li, Jing

doi:10.1016/j.atmosenv.2015.05.021

Cited by 131 publications

(76 citation statements)

References 48 publications

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“…The 10 most prevalent NMHCs measured in this study are presented in Table 3 for comparison with those from the cities in China. The average concentrations of the 10 most prevalent NMHCs observed in this study were basically within the values reported in various Chinese cities (Barletta et al, 2005;Song et al, 2012;An et al, 2014;Li et al, 2015;Zou et al, 2015;Jia et al, 2016). During haze days, the average concentrations of the NMHCs in winter in Beijing were less than those reported in Foshan (S. , whereas they were remarkably greater than those reported in summer in Beijing (Guo et al, 2012).…”

Section: The Levels and Variation Characteristics Of Nmhcs During Thecontrasting

confidence: 41%

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The levels, variation characteristics, and sources of atmospheric non-methane hydrocarbon compounds during wintertime in Beijing, China

Liu

et al. 2017

Atmos. Chem. Phys.

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Abstract. Atmospheric non-methane hydrocarbon compounds (NMHCs) were measured at a sampling site in Beijing city from 15 December 2015 to 14 January 2016 to recognize their pollution levels, variation characteristics, and sources. We quantified 53 NMHCs, and the proportions of alkanes, alkenes, acetylene, and aromatics to the total NMHCs were 49. 8-55.8, 21.5-24.7, 13.5-15.9, and 9.3-10.7 %, respectively. The variation trends in the NMHC concentrations were basically identical and exhibited remarkable fluctuation, which was mainly ascribed to the variation in meteorological conditions, especially wind speed. The diurnal variations in NMHCs on clear days exhibited two peaks during the morning and evening rush hours, whereas the rush hours' peaks diminished or even disappeared on the haze days, implying that the relative contribution of the vehicular emissions to atmospheric NMHCs depended on the pollution status. Two evident peaks of the propane / propene ratios appeared in the early morning before sun rise and at noontime on clear days, whereas only one peak occurred in the afternoon during the haze days, which were attributed to the relatively fast reactions of propene with OH, NO 3 , and O 3 . Based on the chemical kinetic equations, the daytime OH concentrations were calculated to be in the range of 3.47 × 10 5 -1.04 × 10 6 molecules cm −3 on clear days and 6.42×10 5 -2.35×10 6 molecules cm −3 on haze days. The nighttime NO 3 concentrations were calculated to be in the range of 2.82 × 10 9 -4.86 × 10 9 molecules cm −3 on clear days. The correlation coefficients of typical hydrocarbon pairs (benzene / toluene, o-xylene / m,p-xylene, isopentane / n-pentane, etc.) revealed that vehicular emissions and coal combustion were important sources for atmospheric NMHCs in Beijing during the wintertime. Five major emission sources for atmospheric NMHCs in Beijing during the wintertime were further identified by positive matrix factorization (PMF), including gasoline-related emissions (gasoline exhaust and evaporation), coal combustion, diesel exhaust, acetylene-related emissions, and consumer and household products. Coal combustion (probably domestic coal combustion) was found to make the greatest contribution (29.6-33.4 %) to atmospheric NMHCs during haze days.

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Section: The Levels and Variation Characteristics Of Nmhcs During Thecontrasting

confidence: 41%

“…The ratios of o-xylene / m,p-xylene and cis-2-butene / trans-2-butene have been widely used as the indicators for gasoline vehicle exhaust emissions (Velasco et al, 2007;Li et al, 2015). As shown in Fig.…”

Section: The Indicator Of Typical Ratiosmentioning

confidence: 99%

The levels, variation characteristics, and sources of atmospheric non-methane hydrocarbon compounds during wintertime in Beijing, China

Liu

et al. 2017

Atmos. Chem. Phys.

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“…The surrounding area of this site is mainly commercial and residential, and the major nearby emission source of sampling site was vehicular traffic. This site is considered to be representative of a typical urban environment in Beijing (Song et al, 2007;Zhang et al, 2014;Li et al, 2015b;Wang et al, 2015). To evaluate the effect of the control measures, the whole study was divided into two parts: non-control period (11-19 August 2015) and control period (20 August-3 September 2015).…”

Section: Sampling Site Descriptionmentioning

confidence: 99%

Effects of rigorous emission controls on reducing ambient volatile organic compounds in Beijing, China

et al. 2016

Science of The Total Environment

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“…However, the ambient VOC characteristics of relatively small but fast developing cities have not been well studied in China. Published studies on VOCs were mainly carried out in Beijing, Shanghai, Guangzhou and some other big cities, e.g., Nanjing in the YRD [24][25][26][27]. Therefore, it is also important to understand the pollution pattern and to quantify the source contributions during the fast developing period.…”

Section: Introductionmentioning

confidence: 99%

Characteristics and Source Apportionment of Summertime Volatile Organic Compounds in a Fast Developing City in the Yangtze River Delta, China

Zhang

Zhao

et al. 2018

Atmosphere

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Volatile organic compounds (VOCs) are crucial for ozone formation in the Yangtze River Delta (YRD) in China. The characteristics of ambient VOCs in Nantong, a fast developing city in the YRD, were studied. Sixty ambient air samples were taken at five sites in three sampling days during summer time. One hundred and five VOCs were measured, showing that VOC concentration varied between 27.5 ppbv to 33.1 ppbv at five sites; these levels were generally lower than those for some big Chinese cities like Beijing, Shanghai and Nanjing. With larger fractions of alkanes, the Zilang (ZL) and Sanqu (SQ) sites had relatively higher VOC concentrations among the five sites. The oxidation formation potential (OFP) and secondary aerosol formation potential (SOAFP) were estimated to be 125 μg/m3 and 0.76 μg/m3, respectively. These two values were smaller than those in other big cities, as they were dominated by aromatic compounds (e.g., toluene and benzene) of which concentrations in Nantong were found to be lower. The highest toluene concentration was measured in ZL, implying substantial effects of surface coating industry near the site. Through the Positive Matrix Factorization (PMF) model, the identified sources of VOCs included LPG (Liquefied petroleum gas) combustion (13.9%), chemical industry (8.5%), natural gas use (15.6%), gasoline evaporation (12.8%), petrol industry use (11.8%), solvent use (16.2%) vehicle exhausts (12.1%) and surface coating (9.2%). A relatively small contribution from vehicles was found in Nantong compared with other big cities. Moreover, LPG emissions were identified to be relatively important in Nantong, indicated by the large mass fraction of propane and ethane concentrations in the atmosphere.

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Characteristics of volatile organic compounds and their role in ground-level ozone formation in the Beijing-Tianjin-Hebei region, China

Cited by 131 publications

References 48 publications

The levels, variation characteristics, and sources of atmospheric non-methane hydrocarbon compounds during wintertime in Beijing, China

The levels, variation characteristics, and sources of atmospheric non-methane hydrocarbon compounds during wintertime in Beijing, China

Effects of rigorous emission controls on reducing ambient volatile organic compounds in Beijing, China

Characteristics and Source Apportionment of Summertime Volatile Organic Compounds in a Fast Developing City in the Yangtze River Delta, China

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