10/31 · The net effects include the accumulation of ozone, the oxidation of VOCs into oxygenated organic compounds, and the formation of nitrogen-containing compound, and the oxidation of CO into CO 2. Because many of the oxygenated and nitrogen-containing organic compounds are present in the condensed phase due to their low volatility, they are called
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In our present study we tested the health effects among women of controlled exposures to volatile organic compounds (VOCs), with and without ozone (O3), and psychological stress. Each subject was exposed to the following three conditions at 1-week intervals (within-subject factor): VOCs (26 mg/m3), VOCs + O3 (26 mg/m3 + 40 ppb), and ambient air with a 1-min
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Environmental context Volatile organic compounds are precursors of ozone, a pollutant with adverse environmental effects. It is important to determine the associations between the various sources of volatile organic compounds and ozone levels because emission controls are based on sources. We estimated the contributions of specific sources of volatile organic compounds on ozone levels using
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the reaction rate of hydroxyl radical with volatile organic compounds by 2.0–4.0 ppbv h −1 at 1000–1500 m. At nighttime, the deeper boundary layer of URBAN diluted the NO x mixing ratio
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2022/6/27 · Impact of Biogenic Volatile Organic Compounds Emission on Ozone Air Quality in the Sichuan Basin Previous studies have suggested that severe O 3 pollution over China in the year of is in large part due to protracted unfavorable meteorology (featured by hot and stagnant weather conditions) and climate-driven elevated BVOC emissions ( Wu et al., ).
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In this study, the emission characteristics, health risks, and environmental effects of volatile organic compounds (VOCs) from a typical, recycled rubber plant were studied. A total of 15 samples were collected by summa canisters, and 100 VOC species were detected by the GC/MS-FID system.
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4/1 · Abstract. At certain concentrations, volatile organic compounds (VOCs) may harm people's health. This article introduces a new rapid detection method for testing VOCs released from three-layer plywood. A Micro-Chamber/Thermal Extractor was used to analyze the effect of environmental factors on release characteristics of VOCs in the stable phase, and a single
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VOCs are a group of carbon-based chemicals that easily evaporate at room temperature. Many common household materials and products, such as paints and cleaning products, give off VOCs. Common VOCs include acetone, benzene, ethylene glycol, formaldehyde, methylene chloride, perchloroethylene, toluene and xylene. Different VOCs have different health effects, and range
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The policy of excluding negligibly reactive compounds from the regulatory definition of VOC was first laid out in the "Recommended Policy on Control of Volatile Organic Compounds" (42 FR 35314, July 8, 1977) and was supplemented subsequently with the "Interim Guidance on Control of Volatile Organic Compounds in Ozone State Implementation
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2022/6/24 · Plants emit a broad number of Biogenic Volatile Organic Compounds (BVOCs) that can impact urban ozone (O3) production. Conversely, the O3 is a phytotoxic pollutant that causes unknown alterations in BVOC emissions from native plants. In this sense, here, we characterized the constitutive and O3-induced BVOCs for two (2dO3) and four (4dO3) days of
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1995/5/1 · @article{osti_57153, title = {Environmental Chamber Studies of Atmospheric Reactivities of Volatile Organic Compounds: Effects of Varying Chamber and Light Source}, author = {Carter, W. and Luo, D. and Malkina, I. and Pierce, J.}, abstractNote = {Photochemical oxidant models are essential tools for assessing effects of emissions changes on ground-level
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Ozone damages plants by entering leaf openings called stomata and oxidizing (burning) plant tissue during respiration. This damages the plant leaves and causes reduced survival. Many factors can increase the amount of ozone injury such as soil moisture, presence of other air pollutants, insects or diseases, and other environmental stresses.
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Some VOCs react slowly and changes in their emissions have limited effects on local or regional ozone pollution episodes. Those VOCs, determined to have low photochemical reactivity by approved test methods, may be excluded as VOC for regulatory purposes. These determinations are made by regulation and are commonly referred to as VOC Exemptions.
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Coal is well known as the primary energy consumption in China, and the coal chemical industry (CCI) can serve as an important source of volatile organic compounds (VOCs) emissions. However, the characteristics of VOCs emitted from CCI along with their environmental consequences are still poorly unde
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ABSTRACT Volatile organic compounds (VOCs) are important precursors of photochemical smog and secondary organic aerosol (SOA). Quantitatively assessing the impact of VOCs on ozone (O3) formation could provide valuable information for the management of emission reduction and photochemical pollution control.
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Every time you hit the button, then, you are raising your carbon footprint, albeit ever so slightly. Modern-day, CFC-free aerosol sprays also emit volatile organic compounds (VOCs) that contribute
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the major O3 precursors, volatile organic compounds (VOCs) could contribute to the formation of O3 through a series of photochemical reactions, including the hydroxyl radical (OH) initiated oxidation of VOCs, nitrogen cycling driven by peroxyl (RO2) and hydroperoxyl (HO2) oxidation and photolysis, and the combination of oxygen atom (O) with
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Chengdu is a megacity in the southwest of China with high ozone (O 3) mixing ratio.Observation of volatile organic compounds (VOCs), NO 2 and O 3 with high temporal resolution was conducted in Chengdu to investigate the chemical processes and causes of high O 3 levels. The hourly mixing ratios of VOCs, NO 2, and O 3 were monitored by an online system from 28 August to 7 October, 2016.
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Assessing the role of volatile organic compounds (VOCs) in production of ozone and secondary organic aerosol (SOA) is especially important in light of ongoing policy goals. Here, we estimated the ozone formation potential (OFP) and SOA formation potential (SOAP) of anthropogenic and biogenic VOC emissions to evaluate (1) anthropogenic VOCs and associated sectors that dominate OFP and SOAP and
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Environmental Engineering —John Lange, Envirosafe Training and Consultants practitioners." —Luca Cegolon, London School of Hygiene & Tropical Medicine, UK In his latest book, the Handbook of Environmental Engineering, esteemed author Frank Spellman provides a practical view of pollution and its impact on the natural environment.
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Effect of Volatile Organic compounds (VOCs) such as benzene, toluene, ethylbenzene, xylene and other hazardous volatile organic materials on the ozone layer by studying the advantages and disadvantages of this material upon the production of ozone by NOx gases. The rate of reaction, selectivity and optimum concentration of VOCs which can be used to protect the ozone layer and maximize the
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