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.

Layers, Photodissociation, Abstract Photolysis of oxygenated volatile organic compounds (OVOCs) produces a primary source of free radicals, including OH and inorganic and organic peroxy radicals (HO 2 and RO 2 ), consequently increasing photochemical ozone production.

Wakamatsu, S.; et al. Vertical distribution of ozone and VOCs in the low boundary layer of Mexico City. Atmos. Chem. Phys volatile organic compounds and their applications within the

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.

2022/4/8 · ABSTRACT Ambient volatile organic compounds (VOCs) play a critical role in air quality as important precursors for the formation of ozone and secondary organic aerosols.

During exposure to UV rays in sunlight and heat, NOx molecules interact with volatile organic compounds (VOC) and form ground-level (or tropospheric) ozone (O 3 ). Ozone at the ground level is a

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

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.

2022/1/4 · Volatile organic compounds (VOCs) are emitted as gases from certain solids or liquids. VOCs include a variety of chemicals, some of which may have short- and long-term adverse health effects. Concentrations of many VOCs are consistently higher indoors (up to ten times higher) than outdoors. VOCs are emitted by a wide array of products numbering

2022/5/16 · Evaporated VOCs also react in the atmosphere to produce secondary pollutants including ozone and secondary organic aerosol, a contributor to fine particles (PM2.5). While

We tested the hypothesis that the mixture of VOCs, alone or with ozone and resulting reaction products, would cause increased nasal symptoms and markers of nasal injury (protein) or inflammation [polymorphonuclear cells (PMNs), interleuken-8 (IL-8), interleuken-6 (IL-6)]in nasal lavage fluid, compared to a masked air control.

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

Volatile organic compounds (VOCs) are major contributors to air pollution. Based on the emission characteristics of 99 VOCs that daily measured at 10 am in winter from 15 December to 17 January and in summer from 21 July to 25 August in Beijing, the environmental impact and health risk of VOC were assessed.

In China, emissions of ozone (O3)-producing pollutants have been targeted for mitigation to reduce O3 pollution. However, the observed O3 decrease is slower than/opposite to expectations affecting the health of millions of people. For a better understanding of this failure and its connection with anthropogenic emissions, we quantify the summer O3 trends that would have occurred had the weather

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

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.

1/15 · Ambient volatile organic compounds (VOCs) were continuously measured from February to October at an urban site in Wuhan. The characteristics and sources of VOCs and their effect on ozone (O3) formation were studied for the first time. The total VOC levels in Wuhan were relatively low, and

One of the most harmful air pollutants are volatile organic compounds (VOCs), which can be evaporated and transport to atmosphere at ambient conditions. Such materials have been making many

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.

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

2022/6/30 · Volatile organic compounds (VOCs) emissions have become a key environmental concern due to adverse effects on health and environment 1,2,3,4.Extended human exposure to VOCs emissions (e.g