Predictability of hourly nitrogen dioxide concentration

Behm, Svenia; Haupt, Harry

doi:10.1016/j.ecolmodel.2020.109076

Cited by 5 publications

(2 citation statements)

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“…In addition to chemical processes, these emissions are subjected to various other processes linked with meteorological conditions, determining their dispersion and transport from the source region (Belelie et al, 2019). Ultimately, it has been deduced that principal pollutants such as NO x play a critical role in indicating regional air quality (Behm and Haupt, 2020;Brancher, 2021;Wang and Hao, 2012;Zyrichidou et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

Analysis of the first surface nitrogen dioxide concentration observations over the South African Highveld derived from the Pandora-2s instrument

et al. 2022

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Anthropogenic emissions from industry, biomass burning and traffic are significant contributors to the atmospheric loading of nitrogen dioxide on the South African Highveld. These sources are dispersed across the region and emit nitrogen oxides (NO and NO2)into the atmosphere at different elevations above the earth's surface. Additionally, atmospheric stability in the form of surface andelevated inversions decreases the dispersion of air pollutants and stratifies pollutants into distinctive layers above the surface. Thisstudy explores the Highveld near-surface nitrogen dioxide concentrations obtained using the ground-based Pandora-2s monitoringsystem. The Pandora-2s instrument retrieves surface NO2 levels from clear sky measurements using a fully parameterised algorithm.We present the first near-surface concentration measurements of atmospheric NO2 at Wakkerstroom, a site between Volksrust andAmersfoort, downstream of major source conglomerates, the Majuba power station and other industries. These data are exploredin the presence and context of potential background NO2 concentrations in the area derived from other ground-based sensors. Thequasicontinuous data show elevated surface NO2 levels in week 37 (September) of 2020 (7.3 ± 5.7 ppb), while the lowest levels wereobserved in week 15 (April) of 2020 (0.2 ± 0.04 ppb). The elevated surface NO2 levels are driven by dominant emission sources andtransport trajectories, while the accuracy in the measurements is based on the high temporal resolution of the ground-based Pandora2s instrument.

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Section: Introductionmentioning

confidence: 99%

Analysis of the first surface nitrogen dioxide concentration observations over the South African Highveld derived from the Pandora-2s instrument

et al. 2022

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“…Nitrogen dioxide − (NO 2 ) and nitric acid − (HNO 3 ) are the two abundant trace gases in Earth’s atmosphere, and they play key roles in the important chemistry of the troposphere. NO 2 is released into the atmosphere primarily by means of different anthropogenic activities such as emission from vehicle exhausts, industrial fossil fuel burning, thermal power plant, , and, to a small fraction, the biogenic activities of denitrification by bacteria .…”

Section: Introductionmentioning

confidence: 99%

Gas-Phase Oxidation of NO₂ to HNO₃ by Phenol: Atmospheric Implications

Mondal

Biswas

Chattopadhyay

et al. 2021

ACS Earth Space Chem.

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The thermal reaction between nitrogen dioxide and phenol in the gas phase under anaerobic conditions has been investigated by diluting the reactants in dry nitrogen in a glass reaction vessel. Infrared spectroscopic analysis reveals that nitric acid, nitric oxide, and o-nitrophenol are the major products of the reaction. The kinetic analysis reveals the reaction stoichiometry as 3NO2 + PhOH → HNO3 + NO + o-nitrophenol, and the corresponding reaction enthalpy is Δr H 0 = −44.82 kcal/mol. Reaction monitoring by NO2 concentration variation shows that HNO3 formation is linearly correlated with the effective concentration of the nitrogen dioxide dimer (N2O4) formed, and the overall reaction follows a second-order kinetic behavior with respect to N2O4 and phenol, and the estimated rate constant value is (3.53 ± 0.56) × 10–18 cm3 molecule–1 s–1 at 298 K. In the presence of excess NO2, the reaction shows a pseudo-first-order kinetic behavior with a rate constant of (6.67 ± 0.12) × 10–3 s–1. The electronic structure calculation predicts that the N2O4–phenol complex can have multiple conformational minima, and in the lowest-energy conformer, the orientation of the two NO2 molecules about the phenolic −OH group is similar to that of the charge-separated asymmetric ONONO2 dimer of NO2. A radical mechanism has been ruled out, as HONO has not been identified as a product. To the best of our knowledge, the formation of o-nitrophenol in the gas-phase reaction between phenol and NO2 is reported here for the first time. The atmospheric implication of the reaction has been discussed.

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Ozone Concentration Forecasting Based on Artificial Intelligence Techniques: A Systematic Review

Yafouz

Ahmed

Zaini

et al. 2021

Water Air Soil Pollut

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Predictability of hourly nitrogen dioxide concentration

Cited by 5 publications

References 31 publications

Analysis of the first surface nitrogen dioxide concentration observations over the South African Highveld derived from the Pandora-2s instrument

Analysis of the first surface nitrogen dioxide concentration observations over the South African Highveld derived from the Pandora-2s instrument

Gas-Phase Oxidation of NO₂ to HNO₃ by Phenol: Atmospheric Implications

Ozone Concentration Forecasting Based on Artificial Intelligence Techniques: A Systematic Review

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Predictability of hourly nitrogen dioxide concentration

Cited by 5 publications

References 31 publications

Analysis of the first surface nitrogen dioxide concentration observations over the South African Highveld derived from the Pandora-2s instrument

Analysis of the first surface nitrogen dioxide concentration observations over the South African Highveld derived from the Pandora-2s instrument

Gas-Phase Oxidation of NO2 to HNO3 by Phenol: Atmospheric Implications

Ozone Concentration Forecasting Based on Artificial Intelligence Techniques: A Systematic Review

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Gas-Phase Oxidation of NO₂ to HNO₃ by Phenol: Atmospheric Implications