Sources and reactivity of NMHCs and VOCs in the atmosphere: A review

Kansal, Ankur

doi:10.1016/j.jhazmat.2008.11.048

Cited by 260 publications

(133 citation statements)

References 101 publications

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“…They mainly originate in oil refineries, petrochemical and automotive industries, fossil fuels, and petroleum products (1). The operation of petroleum refineries and petrochemical plants is associated with the emission of organic compounds into the atmosphere, causing local and regional pollution that is harmful to people's health.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Volatile Organic Compounds at Petrochemical Complexes in Iran

et al. 2017

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Section: Introductionmentioning

confidence: 99%

Evaluation of Volatile Organic Compounds at Petrochemical Complexes in Iran

et al. 2017

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“…alcohols, aldehydes, organic acids), emitted from various natural and anthropogenic sources such as vegetation, oceans, fossil fuel burning, biomass burning, as well as geochemical processes (Kansal, 2009). On a global scale, biogenic VOC sources (BVOC refers to VOC from biogenic sources) result in an annual release of 1150 Tg C yr −1 (Guenther et al, 1995), mainly emitted in the form of isoprene (C 5 H 8 ) and monoterpenes (varieties of molecules with two isoprene units) (Guenther et al, 1995;Atkinson and Arey, 2003;Kansal, 2009). However, the uncertainties in total emissions are high since the amounts emitted depend on several parameters, including the plant species, temperature, humidity, and also the condition of the plant (Guenther et al, 2000).…”

Section: Introductionmentioning

confidence: 99%

“…However, the uncertainties in total emissions are high since the amounts emitted depend on several parameters, including the plant species, temperature, humidity, and also the condition of the plant (Guenther et al, 2000). In urban areas, VOC from anthropogenic emissions (AVOC) are emitted from mobile and stationary sources (Kansal, 2009). However, estimated AVOC emissions of 161 Tg C yr −1 are lower than the respective BVOC.…”

Section: Introductionmentioning

confidence: 99%

An improved glyoxal retrieval from OMI measurements

et al. 2014

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Abstract. Satellite observations from the SCIAMACHY, GOME-2 and OMI spectrometers have been used to retrieve atmospheric columns of glyoxal (CHOCHO) with the DOAS method. High CHOCHO levels were found over regions with large biogenic and pyrogenic emissions, and hot-spots have been identified over areas of anthropogenic activities.This study focuses on the development of an improved retrieval for CHOCHO from measurements by the OMI instrument. From sensitivity tests, a fitting window and a polynomial degree are determined. Two different approaches to reduce the interference of liquid water absorption over oceanic regions are evaluated, achieving significant reduction of the number of negative columns over clear water regions. The impact of using different absorption cross-sections for water vapour is evaluated and only small differences are found. Finally, a high-temperature (boundary layer ambient: 294 K) absorption cross-section of nitrogen dioxide (NO 2 ) is introduced in the DOAS retrieval to account for potential interferences of NO 2 over regions with large anthropogenic emissions, leading to improved fit quality over these areas. A comparison with vertical CHOCHO columns retrieved from GOME-2 and SCIAMACHY measurements over continental regions is performed, showing overall good consistency. However, SCIAMACHY CHOCHO columns are systematically higher than those obtained from the other instruments.Using the new OMI CHOCHO data set, the link between fires and glyoxal columns is investigated for two selected regions in Africa. In addition, mapped averages are computed for a fire event in Russia between mid-July and midAugust 2010. In both cases, enhanced CHOCHO levels are found in close spatial and temporal proximity to elevated levels of MODIS fire radiative power, demonstrating that pyrogenic emissions can be clearly identified in the new OMI CHOCHO product.

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“…All compounds primarily originate from various anthropogenic activities, mainly combustion processes (e.g., vehicle exhausts and man-made biomass burning); production, treatment, storage, and distribution of fossil fuels, industrial processes (solvent) and landfills (Barletta et al, 2005). Ethyne is used as a tracer for anthropogenic emissions because it is solely derived from combustion (Lee et al, 2006), propane is mainly emitted from natural gas leakages while butanes and pentanes are emitted mainly from petrol evaporation (Kansal, 2009). Benzene is a component of unburned fossil fuels and a byproduct of the incomplete combustion of other hydrocarbons in fossil fuels (Schauer et al, 2002) and has been strictly regulated because it is a Class 1 human carcinogen.…”

Section: Introductionmentioning

confidence: 99%

Non-Methane Volatile Organic Compounds in the Background Atmospheres of a Southern European Mountain Site (Mt. Cimone, Italy): Annual and Seasonal Variability

Vullo

Furlani

Arduini

et al. 2016

Aerosol Air Qual. Res.

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Since January 2010 continuous high-frequency in situ measurements of a range of anthropogenic Non-Methane Volatile Organic Compounds (NMVOCs) has been carried out at the World Meteorological Organisation Global Atmospheric Watch observatory at Mt. Cimone, on the highest peak of the Italian Northern Apennines, at the border between the Po Valley and the Mediterranean Basin. Five-year (2010Five-year ( -2014 time series of eleven NMVOCs, including aromatic and aliphatic species, have been analysed in order to derive average mixing ratios and detect annual and seasonal variability. Recent studies conducted in Europe, mainly in urban areas, have reported a decrease in atmospheric NMVOCs. Here we investigate how the decline in emissions, due to the implementation of air pollution policies, is reflected in the annual variability of NMVOC mixing ratios measured at a regional background location. Analysis of temporal trends for wellmixed conditions showed statistically significant decreases in ethyne, n-pentane and ethyl-benzene, while no significant trends were found for propane, butanes, i-pentane, toluene and xylenes. The seasonal variability of NMVOCs has been studied showing clear seasonal cycles for longer lived compounds and cycles with smaller seasonal amplitudes for shorterlived species. We used the propane time series to describe the seasonal cycle and to verify to what extent the mixing ratios of propane have been depleted by OH oxidation. We found that, during the summer, different transport times to the receptors and different source distribution are the main responsible for the relatively low integrated OH concentrations at Mt. Cimone.

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Sources and reactivity of NMHCs and VOCs in the atmosphere: A review

Cited by 260 publications

References 101 publications

Evaluation of Volatile Organic Compounds at Petrochemical Complexes in Iran

Evaluation of Volatile Organic Compounds at Petrochemical Complexes in Iran

An improved glyoxal retrieval from OMI measurements

Non-Methane Volatile Organic Compounds in the Background Atmospheres of a Southern European Mountain Site (Mt. Cimone, Italy): Annual and Seasonal Variability

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