Effects of regional transport from different potential pollution areas on volatile organic compounds (VOCs) in Northern Beijing during non-heating and heating periods

Niu, Yueyuan; Yan, Yulong; Chai, Jianwei; Zhang, Xiangyu; Xu, Yang; Duan, Xiaolin; Wu, Jing; Lin, Peng

doi:10.1016/j.scitotenv.2022.155465

Cited by 18 publications

(8 citation statements)

References 51 publications

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“…Among all these factors, precursor VOCs and OVOCs could have great impacts. Since such precursors tend to come along with pollution (Niu et al, 2022;Yao et al, 2021), OOM concentration also showed a strong association with the 370 pollution level (Fig. S11).…”

Section: Condensable Vaporsmentioning

confidence: 97%

Measurement Report: Year-to-year Variability and Influence of Winter Olympics and other Special Events on Air Quality in Urban Beijing during Wintertime

Guo

Deng

Ovaska

et al. 2022

Preprint

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Abstract. Comprehensive measurements are vital to obtain big enough datasets for better understanding the complex atmosphere and further improving the air quality. To investigate the year-to-year variabilities of air quality and influences of special events (Beijing Winter Olympics, COVID lockdown and Chinese New Year) on it during the wintertime in a polluted urban air, we conducted comprehensive observations in Beijing, China, during January 1st – February 20th, in the years from 2019 to 2022. The mass concentration of PM2.5 and its composition (organics, nitrate, sulfate, ammonium, chloride and black carbon), number size distributions of particles (down to ~1 nm) and ions, gaseous pollutants (CO, NOx, SO2, O3), condensable vapors (sulfuric acid and oxygenated organic molecules), as well as meteorological parameters were simultaneously measured. We selected the period before January 22nd without any special events in each year to show the year-to-year variabilities of the air quality. We found that the concentrations of PM2.5, black carbon, chloride, organics, CO, NOx, total oxygenated organic molecules and number concentration of sub 3 nm particles showed similar year-to-year variabilities, decreasing from 2019 to 2021 and then increasing in 2022. On the contrary, SO2 concentrations decreased year by year due to the significant emission reduction, leading to decreasing mass concentrations of sulfate and number concentration of sulfuric acid monomer and dimer from 2019 to 2022. As for the influence of special events, due to the favorable meteorological conditions together with reductions in anthropogenic emissions, there were basically no haze events during Beijing Winter Olympics. Although there was emission reduction also during the COVID lockdown period, especially for NOx, the enhancement of secondary inorganic aerosol formation, together with unfavorable meteorological conditions, caused severe haze events during this period. Additionally, these special events had only little impacts on the new particle formation processes. These results provide useful information to the development of more targeted pollution control plans.

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Section: Condensable Vaporsmentioning

confidence: 97%

Measurement Report: Year-to-year Variability and Influence of Winter Olympics and other Special Events on Air Quality in Urban Beijing during Wintertime

Guo

Deng

Ovaska

et al. 2022

Preprint

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“…During the heating season, natural gas and coal combustion for heating can release plenty of volatile organic compounds (VOCs) (Wang et al 2013, Zhang et al 2020. In urban North China, the mean concentration of VOCs during heating season has been reported to be ∼1.8 times that of clean period (Gu et al 2020), and the contribution of coal combustion to VOCs emission during heating season is about twice than that of nonheating season (Niu et al 2022). The contribution of N 2 O 5 + H 2 O pathway during the non-heating season was significantly higher (p < 0.01; figure 6(c)) than that during the heating season.…”

Section: Concentrations and Isotopic Composition Of No −mentioning

confidence: 99%

Investigating atmospheric nitrate sources and formation pathways between heating and non-heating seasons in urban North China

Yan

et al. 2023

Environ. Res. Lett.

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In urban North China, nitrate (NO3-) is a primary contributor to haze formation. So far, the production processes and source apportionments of atmospheric NO3- during the heating season (i.e., the wintertime) have not yet been well understood. This study determined δ15N-NO3-, δ18O-NO3-, and Δ17O-NO3 of aerosol samples to compare the potential sources and formation pathways of atmospheric NO3- during heating (November to March) and non-heating (April to May) seasons. Combining stable isotope composition with the MixSIAR model based on Δ17O-NO3- showed that NO3 + DMS/HC pathway was the dominant process of atmospheric nitrate formation during the heating season (mean = 52.88 ± 16.11%). During the non-heating season, the contributions of NO3 + DMS/HC (mean = 37.89 ± 13.57%) and N2O5 + H2O (mean = 35.24 ± 3.75%) pathways were comparable. We found that Δ17O-NO3 was negatively correlated with wind speed and positively correlated with relative humidity during the heating season, possibly associated with the sources and production of atmospheric NO3-. In specific, in a dust storm event, the very low Δ17O-NO3 is likely associated with particles from land surface. Under the premise of considering 15N fractionation, the constraint-based on δ15N-NO3- illustrated that coal combustion was the major source of NOx emission during the heating season, and the relative contribution of coal combustion decreased rapidly from the heating season (mean = 42.56 ± 15.50%) to the non-heating season (mean = 21.86 ± 4.91%). Conversely, the proportion of NOx emitted by soil microbes rose significantly from the heating (mean = 9.67 ± 5.99%) to non-heating season (mean = 24.02 ± 11.65%). This study revealed differences in the sources and formation processes of atmospheric NO3 during the heating and non-heating seasons, which are of significance to atmospheric nitrogen oxide/nitrate pollution mitigation.

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“…Because of their roles in aggravating climate change, forming photochemical smog, and inducing acid rain, , gaseous pollutants, especially sulfur and nitrogen oxides (SO 2 , NO, and NO 2 ), carbon monoxide (CO), and volatile organic compounds (VOCs), are identified as particularly hazardous. Recently, VOC pollution has received considerable attention from the research community due to their elevated concentrations in certain regions. , …”

Section: Introductionmentioning

confidence: 99%

“…VOCs are carbon-containing organic chemicals that have high vapor pressure under ambient conditions . Both natural and anthropogenic activities release VOCs into the atmosphere, with the proportion of human-made VOCs steadily increasing. , While there exist over 300 types of ambient VOCs, they can generally be categorized into groups of aldehydes, aromatic compounds, polycyclic aromatic hydrocarbons, halogenated compounds, alcohols, and ketones . When present at concentrations beyond the safe level, VOCs, especially ketones, aromatic compounds, and halogenated hydrocarbons, can produce profound adverse effects on human health and the ecological environment. − For instance, inhalation of high-concentration ketones like acetone can result in eye irritation and central nervous system depression. , Exposure to benzene, an aromatic compound, at dangerous levels poses fatal risks of leukemia and lymphomas .…”

Section: Introductionmentioning

confidence: 99%

BC₆N Monolayer as a Potential VOC Adsorbent in Mitigation of Environmental Pollution: A Theoretical Perspective

Jiang,

Luo

2023

ACS Omega

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Rapid economic growth has led to severe air pollution, which poses threats to both the environment and public health. Among the major contributors to this issue are volatile organic compounds (VOCs), the abatement methods of which have received considerable attention from the research community. Recently, an adsorption technology employing two-dimensional monolayers has emerged as a promising strategy for VOC control. In the current investigation, we examined the adsorption behaviors of three prevalent VOCs, namely, acetone, benzene, and tetrachloromethane, on both pristine and Pd-doped BC 6 N monolayers. Through first-principles calculations based on density functional theory, it was revealed that pristine BC 6 N adsorbs acetone, benzene, and tetrachloromethane with modest adsorption energies of −0.003, −0.036, and −0.017 eV, respectively. These weak interactions make the adsorbate–adsorbent systems especially unstable, causing the VOCs to desorb from the pristine monolayer under increased ambient temperature or other environmental disturbances. The introduction of an interstitial Pd dopant has induced a significant improvement in the adsorption performance of the BC 6 N monolayer. Specifically, the values of adsorption energy for acetone and benzene on the Pd-doped BC 6 N monolayer experience a remarkable increase, measuring −0.745 and −1.028 eV, respectively. Moreover, the charge transfer is enhanced along with reduced adsorption distances, indicating strong chemisorption of acetone and benzene on the Pd-doped BC 6 N monolayer. Our results establish the Pd-doped BC 6 N monolayer as an efficient adsorbent for the toxic gases, particularly acetone and benzene, carrying practical implications for air quality improvement and environmental sustainability.

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Effects of regional transport from different potential pollution areas on volatile organic compounds (VOCs) in Northern Beijing during non-heating and heating periods

Cited by 18 publications

References 51 publications

Measurement Report: Year-to-year Variability and Influence of Winter Olympics and other Special Events on Air Quality in Urban Beijing during Wintertime

Measurement Report: Year-to-year Variability and Influence of Winter Olympics and other Special Events on Air Quality in Urban Beijing during Wintertime

Investigating atmospheric nitrate sources and formation pathways between heating and non-heating seasons in urban North China

BC₆N Monolayer as a Potential VOC Adsorbent in Mitigation of Environmental Pollution: A Theoretical Perspective

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Effects of regional transport from different potential pollution areas on volatile organic compounds (VOCs) in Northern Beijing during non-heating and heating periods

Cited by 18 publications

References 51 publications

Measurement Report: Year-to-year Variability and Influence of Winter Olympics and other Special Events on Air Quality in Urban Beijing during Wintertime

Measurement Report: Year-to-year Variability and Influence of Winter Olympics and other Special Events on Air Quality in Urban Beijing during Wintertime

Investigating atmospheric nitrate sources and formation pathways between heating and non-heating seasons in urban North China

BC6N Monolayer as a Potential VOC Adsorbent in Mitigation of Environmental Pollution: A Theoretical Perspective

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BC₆N Monolayer as a Potential VOC Adsorbent in Mitigation of Environmental Pollution: A Theoretical Perspective