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Long-term exposure to ambient ozone appears to accelerate arterial conditions that progress into cardiovascular disease and stroke, according to a new University at Buffalo study. The study found that chronic exposure to ozone was associated with a progression of thickening of the main artery that supplies blood to the head and neck.
Ozone levels across much of North America and Europe dropped significantly between 2000 and 2014. People living in parts of southern Europe, South Korea and southern Japan and China also experienced more than 15 days a year of ozone levels above 70 ppb. Trends in daily maximum ozone levels (known as 4MDA8) at urban and non-urban sites.
They found that the increase in ozone burden due to the spatial distribution change slightly exceeds the combined influences of the increased emission magnitude and global methane. Based on their findings, they suggested that emission increases in Southeast, East and South Asia may be most important for the ozone change.
Ozone pollution near Earth’s surface is one of the main ingredients of summertime smog. It is also not directly measurable from space due to the abundance of ozone higher in the atmosphere, which obscures measurements of surface ozone. —Jin et al.
Researchers at the University of Pittsburgh have developed a fluorescent molecular probe that can selectively detect ozone—in preference to other reactive oxygen species—in both atmospheric and biological samples. Ground-level ozone exposure is a growing global health problem, especially in urban areas. Garner, Claudette M.
course, fine, ultrafine particles) and gaseous pollutants such as ozone, on vascular function. Key research questions focused on components of air pollution (particulate matter, ozone, nitrogen dioxide, carbon monoxide, and sulfur dioxide) that are particularly damaging to the cardiovascular system and mechanisms that damage the vessels.
The US Environmental Protection Agency (EPA) announced $5,959,842 million in research funding to nine institutions to improve air quality models used to simulate ozone, particulate matter (PM), regional haze, air toxics, and emerging pollutants. It will also inform the development of strategies for improving air quality.
Ozonolysis—the cleavage of carbon-carbon double bonds through reaction with ozone—is a reaction that plays a key role in a number of fields, including synthetic chemistry and tropospheric removal of unsaturated hydrocarbons. —Professor Dudley Shallcross, Professor in Atmospheric Chemistry at The University of Bristol.
Bromine also can remove ozone from the lowest layer of the atmosphere, the troposphere. Despite ozone’s beneficial role blocking harmful radiation in the stratosphere, ground-level ozone is a harmful pollutant. Bromine then reacts with a gaseous form of mercury, turning it into a pollutant that falls to Earth’s surface.
And hydroxyls drive long chains of reactions involving other common gases, including ozone. That’s noteworthy because nitrogen oxides have primarily been associated with ozone formation and warming in the past. In the chemical soup of the lower atmosphere, however, sulfur dioxide isn’t the only substance interacting with hydroxyl.
To do so, we employ integrated assessment models (IAMs), which combine insights from multiple scientific disciplines to tabulate source-specific damages for 5 such pollutants that contribute to ambient levels of PM2.5. We do not include damages from morbidity or other pollutants such as exposure to nitrogen oxides (NO x ) or ozone.
The new measurements will provide further insight into hydrocarbon combustion and atmospheric chemistry. For unsaturated hydrocarbons—molecules with at least one C=C double bond—a prominent removal mechanism is reaction with ozone, called ozonolysis. Earlier post.).
Dr. Blake has carried out measurements of atmospheric volatile organic compounds that have provided critical insights into their roles in air pollution and climate change. Donald Blake, professor of chemistry, University of California Irvine. The selection committee is comprised of past award winners.
The use of petroleum-derived fuels is an important source of reactive gas-phase organic carbon that provides key precursors to the formation of secondary OA (SOA) and tropospheric ozone. We provide the ability to predict emissions of SOA precursors and SOA formation that is consistent with fuel use data and ambient measurements.
Transportation is one of the largest contributors to urban air pollution for pollutants such as carbon monoxide, nitrogen oxides, benzene, ozone, and fine particulate matter (PM 2.5 ). As such, cities are a focal point for understanding and addressing environmental health issues. is attributable to motor vehicles.
The finding provides insight into how to make better catalytic converters. Recently, researchers have produced a new zeolite that is surprisingly stable and makes very little nitrous oxide from nitric oxide, a chemical that depletes ozone. This intermediate is very similar to those found in nitrite reductase enzyme systems.
60% of ground-level ozone (O 3 ) precursors, 6% of fine particulate matter (PM 2.5 ), and 22% of greenhouse gases (GHGs) emitted. In general, methods presented here can provide insight into any spatially or temporally inhomogeneous environmental impact categories, such as water quality and availability, soil properties, or wildlife habitats.
High-performance computing offers critical new insight into these phenomena, which in turn will accelerate the product’s entry into the market. Advancing to 10 Ah battery prototypes, Sepion faces challenges in membrane manufacturing related to polymer processing and the molecular basis for membrane performance and durability.
Isoprene, a five-carbon diene formed naturally in plants and animals and a precursor of ozone, contributes more than 40% of these emissions. Wennberg and colleagues also used oxygen isotopes to gain insight into the chemical mechanism yielding epoxides. Isoprene is emitted by many deciduous trees, with oaks playing the biggest role.
As economists and social scientists, we draw two fundamental insights from these examples of forced experimentation. One example where this strategy has been successfully employed is the Montreal Protocol on Substances That Deplete the Ozone Layer. Such a plan can disarm opposition before it arises.
Furthermore, these simulations provided insights into how IPSR seals would perform under extreme conditions, including exposure to humidity, rapid temperature changes, and prolonged mechanical stress. This predictive approach enabled early detection of potential failure points, allowing for targeted improvements before mass production.
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