Emission characteristics of 99 NMVOCs in different seasonal days and the relationship with air quality parameters in Beijing, China

Gu, Yangyang; Li, Qianqian; Wei, Da; Gao, Lian; Tan, Ling; Su, Guoshao; Liu, Guorui; Liu, Wenbin; Li, Chuanqi; Wang, Qingliang

doi:10.1016/j.ecoenv.2018.11.091

Cited by 39 publications

(17 citation statements)

References 43 publications

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“…Health risk assessment in Zhengzhou was compared with other cities, as shown in Table S3. Overall, the values of risk assessment in this study are evidently lower than those reported in Beijing (Gu et al, 2019) and Langfang (Yang et al, 2019a), whereas they are higher than the summer of 2018 in Zhengzhou (Li et al, 2020). Evaluated health risk assessment before, during, and after the control period shows cumulative LCR was 5.8 × 10 −5 , 5.1 × 10 −5 , and 6.3 × 10 −5 , respectively, during the three periods (Fig.…”

Section: Risk Assessment Of Individual Voc Speciescontrasting

confidence: 61%

Characterization of ambient volatile organic compounds, source apportionment, and the ozone–NOx–VOC sensitivities in a heavily polluted megacity of central China: effect of sporting events and emission reductions

Shang

Yin

et al. 2021

Atmos. Chem. Phys.

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Abstract. The implementation of strict emission control during the 11th National Minority Games (NMG) in September 2019 provided a valuable opportunity to assess the impact of such emission controls on the characteristics of VOCs and other air pollutants. Here, we investigated the characteristics of VOCs and the O3–NOx–VOC sensitivity comprehensively in Zhengzhou before, during, and after the NMG by delivering field measurements combined with WRF-CMAQ (Weather Research and Forecasting Community Multiscale Air Quality) model simulations. The average mixing ratios of VOCs during the control periods were 121 ± 55 µg m−3 and decreased by about 19 % and 11 % before and after emission reduction. The ozone precursors (NOx) also decreased significantly during the control period; however, the ozone pollution was severe during the entire observation period. Positive matrix factorization analysis indicated seven major sources of ambient VOCs, including coal combustion, biomass burning, vehicle exhausts, industrial processes, biogenic emissions, solvent utilization, and liquefied petroleum gas (LPG). The results show that the major source emissions, such as coal combustion and solvent utilization, were significantly reduced during the control period. As for ozone formation potential (OFP), the value during the control period was 183 ± 115 µg m−3, which was 0.23 and 0.17 times lower than before and after the control period, respectively. Solvent utilization and combustion controls were the most important measures taken to reduce OFP during the NMG period. Control policies can effectively reduce carcinogenic risk. However, non-cancer risks of ambient VOC exposures were all exceeding the safe level (hazard quotient = 1) during the sampling periods, and emphasis on the reduction of acrolein emissions was needed. In addition, the WRF-CMAQ model simulation indicated that O3 formation was controlled by VOCs in Zhengzhou. The results of the Empirical Kinetic Modeling Approach showed that the NOx reduction in Zhengzhou might lead to higher ozone pollution. It is suggested that reduction ratios of the precursors (VOCs : NOx) should be more than 2, which can effectively alleviate ozone pollution.

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Section: Risk Assessment Of Individual Voc Speciescontrasting

confidence: 61%

Characterization of ambient volatile organic compounds, source apportionment, and the ozone–NOx–VOC sensitivities in a heavily polluted megacity of central China: effect of sporting events and emission reductions

Shang

Yin

et al. 2021

Atmos. Chem. Phys.

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“…Phys. (Liu et al, 2015) and the fourth dot indicates data observed at Chaoyang District (CY; (Gu et al, 2019)).…”

Section: Effect Of Land Use and Biogenic Emission On Ozonementioning

confidence: 99%

Substantial ozone enhancement over the North China Plain from increased biogenic emissions due to heat waves and land cover in summer 2017

Ma¹,

Gao²,

Wang³

et al. 2019

Preprint

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Abstract. In the summer of 2017, heavy ozone pollution swamped most of the North China Plain (NCP), with the maximum regional average of daily maximum 8-h ozone concentration (MDA8) reaching almost 120&#8201;ppbv. In light of the continuing reduction of anthropogenic emissions in China, the underlying mechanisms for the occurrences of these regional extreme ozone episodes are elucidated from two perspectives: meteorology and biogenic emissions. The significant positive correlation between MDA8 and temperature, which is amplified during heat waves concomitant with stagnant air and no precipitation, supports the crucial role of meteorology in driving high ozone concentrations. We also find that biogenic emissions are enhanced due to factors previously not considered. During the heavy ozone pollution episodes in June 2017, biogenic emissions driven by high vapor pressure deficit (VPD), land cover change and urban landscape yield an extra mean MDA8 ozone of 3.08, 2.79 and 4.74&#8201;ppbv, respectively over the NCP, which together contribute as much to MDA8 ozone as biogenic emissions simulated using the land cover of 2003 and ignoring VPD and urban landscape. In Beijing, the biogenic emission increase due to urban landscape has a comparable effect on MDA8 ozone to the combined effect of high VPD and land cover change between 2003 and 2016. This study highlights the vital contributions of heat waves, land cover change and urbanization to the occurrence of extreme ozone episode, with significant implications for ozone pollution control in a future when heat wave frequency and intensity are projected to increase under global warming.

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“…Health risk assessment in Zhengzhou was compared with other cities, as shown in Table S3. Overall, the values of risk assessment in this study are evidently lower than those reported in Beijing (Gu et al, 2019) and Langfang (Yang et al, 2019a), whereas higher than the summer of 2018 in Zhengzhou (Li et al, 2020). Evaluated health risk assessment before, during, and after the control period shows cumulative LCR was 5.8× 10 −5 , 5.1× 10 −5 and 6.3× 10 −5 respectively during the three periods (Fig.…”

Section: Risk Assessment Of Individual Voc Speciesmentioning

confidence: 46%

Characterization of ambient volatile organic compounds, source apportionment, and the ozone-NOx-VOC sensitivities in a heavily polluted megacity of central China: Effect of sporting events and the emission reductions

Shang

Yin

et al. 2021

Preprint

View full text Add to dashboard Cite

Abstract. Abstract: The implementation of strict emission control during the 11th National Minority Games (NMG) in September 2019 provided a valuable opportunity to assess the impact of such emission controls on the characteristics of VOCs and other air pollutants. Here, we investigated the characteristics of VOCs and the O3-NOx-VOCs sensitivity comprehensively in Zhengzhou before, during, and after the NMG by delivering field measurements combined with the WRF (Weather Research and Forecasting)-CMAQ (Community Multi-scale Air Quality) model simulations. The average mixing ratios of VOCs during the control periods were 34 ppbv, and cut down by about 16% before and after emission reduction. The ozone precursors (NOx) also decreased significantly during the control period; however, the ozone pollution was severe during the entire observation period. Positive Matrix Factorization analysis indicated seven major sources of ambient VOCs, including coal combustion, biomass burning, vehicle exhausts, industrial processes, biogenic emissions, solvent utilization and liquefied petroleum gas (LPG). The results show that the major source emissions, such as coal combustion and solvent utilization, were significantly reduced during the control period. As for ozone formation potential (OFP), the value during the control period was 183 μg/m3, which was 0.23 and 0.17 times lower than those before and after control period, respectively. Solvent utilization and combustion controls were the most important measures taken to reduce OFP during NMG period. Through control policies, it can effectively reduce carcinogenic risk. However, non-cancer risks of ambient VOC exposures were all exceeding the safe level (hazard quotient = 1) during the sampling periods, and emphasis on the reduction of acrolein emissions was needed. In addition, the WRF/CMAQ model simulation indicated that O3 formation was controlled by VOCs in Zhengzhou. The results of the Empirical Kinetic Modelling Approach showed that the NOx reduction in Zhengzhou might led to higher ozone pollution. It is suggested that reduction ratios of the precursors (VOCs : NOx) is more than 2, which can effectively alleviate ozone pollution.

show abstract

Emission characteristics of 99 NMVOCs in different seasonal days and the relationship with air quality parameters in Beijing, China

Cited by 39 publications

References 43 publications

Characterization of ambient volatile organic compounds, source apportionment, and the ozone–NO<sub>x</sub>–VOC sensitivities in a heavily polluted megacity of central China: effect of sporting events and emission reductions

Characterization of ambient volatile organic compounds, source apportionment, and the ozone–NO<sub>x</sub>–VOC sensitivities in a heavily polluted megacity of central China: effect of sporting events and emission reductions

Substantial ozone enhancement over the North China Plain from increased biogenic emissions due to heat waves and land cover in summer 2017

Characterization of ambient volatile organic compounds, source apportionment, and the ozone-NO<sub>x</sub>-VOC sensitivities in a heavily polluted megacity of central China: Effect of sporting events and the emission reductions

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Emission characteristics of 99 NMVOCs in different seasonal days and the relationship with air quality parameters in Beijing, China

Cited by 39 publications

References 43 publications

Characterization of ambient volatile organic compounds, source apportionment, and the ozone–NO&lt;sub&gt;x&lt;/sub&gt;–VOC sensitivities in a heavily polluted megacity of central China: effect of sporting events and emission reductions

Characterization of ambient volatile organic compounds, source apportionment, and the ozone–NO&lt;sub&gt;x&lt;/sub&gt;–VOC sensitivities in a heavily polluted megacity of central China: effect of sporting events and emission reductions

Substantial ozone enhancement over the North China Plain from increased biogenic emissions due to heat waves and land cover in summer 2017

Characterization of ambient volatile organic compounds, source apportionment, and the ozone-NO&lt;sub&gt;x&lt;/sub&gt;-VOC sensitivities in a heavily polluted megacity of central China: Effect of sporting events and the emission reductions

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Characterization of ambient volatile organic compounds, source apportionment, and the ozone–NO<sub>x</sub>–VOC sensitivities in a heavily polluted megacity of central China: effect of sporting events and emission reductions

Characterization of ambient volatile organic compounds, source apportionment, and the ozone–NO<sub>x</sub>–VOC sensitivities in a heavily polluted megacity of central China: effect of sporting events and emission reductions

Characterization of ambient volatile organic compounds, source apportionment, and the ozone-NO<sub>x</sub>-VOC sensitivities in a heavily polluted megacity of central China: Effect of sporting events and the emission reductions