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In early 2020, UK-based independent testing firm Emissions Analytics published a study claiming that tire particulate wear emissions were 1,000 times worse than exhaust emissions ( earlier post ). As testament to the filtration efficiency of the latest gasoline particulate filters (GPFs), tailpipe mass emissions are now as low as 0.02
A study by European researchers has found that two-stroke (2S) scooters, although constituting a small fraction of the fleet, can dominate urban vehicular pollution through organic aerosol and aromatic emission factors up to thousands of times higher than from other vehicle classes. —Platt et al. Platt et al. Click to enlarge.
A study led by environmental health scientists at Columbia University Mailman School of Public Health examined the release of vapors from gasoline station vent pipes, and found benzene emissions were 10 times higher than estimates used in setback regulations that determine how close schools, playgrounds, and parks can be to the facilities.
A study by a pair of researchers at Northwestern University found that when fuel prices drove residents of São Paulo, Brazil, to switch from ethanol to gasoline in their flexible-fuel vehicles, local ozone levels dropped 20%. The four-year study by chemist Franz M. Their paper appears in the journal Nature Geoscience.
Environmental impacts of gasoline and E85. previous studies have followed the general framework of life cycle assessment (LCA), they have focused almost exclusively on quantifying the energy balance and GHG emissions associated with biofuels production. Error bar shows regional variations for E85. GW = global warming; Eut.
Fuel-cycle SO 2 emissions of EVs compared to those of gasoline ICEVs and HEVs in China, current (left) and future (right). The study was published online 24 May in the ACS journal Environmental Science & Technology. Among the findings of the study: CO 2. Credit: ACS, Huo et al. Click to enlarge. and NO x emissions.
Based on on-road measurements in their study, a team from the University of California Berkeley has estimated that, as of 2010, light-duty (LD) gasoline vehicles were responsible for 85% of CO; 18% of NO x ; 18% of organic aerosol (OA); and 6% of black carbon (BC) emissions from on-road motor vehicles in the United States.
Now, researchers at Imperial College London have shown that bioethanol production from bamboo in China is both technically and economically feasible, as well as cost-competitive with gasoline. An open access paper on their study is published in Biotechnology for Biofuels. —Littlewood et al. Littlewood et al. Click to enlarge.
Diesel is currently taxed at a lower level than gasoline in Europe; however, since 2011 the EC has been considering reversing that situation by making energy taxes systematically reflect the CO 2 performance of the energy product. As on a volumetric basis, diesel contains more carbon than gasoline, the tax on diesel fuel would increase.
Consumer products such as shampoo, cleaning products and paint now contribute as much to emitted volatile organic compounds (VOCs) in cities as tailpipe emissions from vehicles, according to a new study led by NOAA. Total VOC emission factors for end uses of petrochemical sources in the study.
The Health Effects Institute (HEI) has launched two new studies funded under RFA 21-1, Quantifying Real-World Impacts of Non-Tailpipe Particulate Matter Emissions. The new studies are: Improved Characterization of the Real-World Contributions and Impacts of Non-tailpipe Particulate Matter Emissions ,” led by Greg Evans, University of Toronto.
Renault recently made public the findings of an internal study, published first in October 2011, detailing and comparing the lifecycle assessments (LCAs) of the battery-electric and two internal combustion engined versions (gasoline and diesel) of the Renault Fluence. Gasoline Fluence 16V. Click to enlarge. Diesel Fluence dCi.
Infants born to women exposed to high levels of air pollution in the week before delivery are more likely to be admitted to a newborn intensive care unit (NICU), suggests an analysis by researchers at the US National Institutes of Health (NIH). The study was led by Pauline Mendola, Ph.D., It appears in Annals of Epidemiology.
A “well-to-wheel” life cycle assessment (LCA) by a team from synthetic fuels producer Greyrock ( earlier post ), and the National Renewable Energy Laboratory (NREL) has determined the potential reduction of greenhouse gases and criteria pollutant emissions from the use of synthetic fuels directly converted from flare gas. billion liters (18.8
Contrary to expectations, exhaust from gasoline vehicles contributes more to the production of secondary organic aerosols (SOA) than exhaust from diesel vehicles, according to a new study by scientists from the Cooperative Institute for Research in Environmental Sciences (CIRES), NOAA’s Earth System Research Laboratory (ESRL) and other colleagues.
Results of a new study suggest that emissions particle emissions from airplane traffic at Los Angeles International Airport (LAX) are a major source of particle number (PN) concentrations in the Los Angeles area that are of the same general magnitude as the entire urban freeway network. Spatial pattern of PN concentration. Click to enlarge.
A study by a team of researchers from France and the US found that the origin of volatile hydrocarbons, other than methane, present in city air is mainly gasoline-powered vehicles. They therefore concluded that gasoline engines are probably the main source of volatile hydrocarbons in both cities. Borbon, A., Gilman, W.
Their study is publishedin the ACS journal Environmental Science & Technology. The researchers assessed the gaseous, particulate, and genotoxic pollutants from two current technology gasoline direct injection vehicles when tested in their original configuration and with a catalyzed gasoline particulate filter (GPF).
A new study finds that ethanol blends reduce particulate matter (PM) coming out of the tailpipe, which in turn reduces overall toxic emissions. The study was conducted by the University of California Riverside and the University of Wisconsin, Madison and commissioned by the Urban Air Initiative.
Scientists from UCLA’s Fielding School of Public Health have found a possible link between exposure to traffic-related air pollution and several rare childhood cancers. Pollution exposure was estimated for the area around each child’s home for each trimester of their mother’s pregnancy and during their first year of life.
A new study by an international team led by researchers from the Paul Scherrer Institute (PSI) in Switzerland has found that modern diesel passenger cars equipped with diesel particulate filters (DPFs) emit fewer carbonaceous particulates than gasoline-powered vehicles. a) Aerosol emission factors (g kg −1 fuel) measured in the study.
When including Land Use Change (LUC) factors, Brazilian sugar cane ethanol and soybean biodiesel have much larger life-cycle emissions than conventional gasoline and biodiesel for six regulated, non-greenhouse gas (GHG) air pollutants, according to a study led by a team from the University of California, Merced. 683 g PM 2.5
A scatter plot of CO, as a tracer for pollution, versus CO 2 , as a tracer for the amount of combustion, for 2002 and 2010. Between 2002 and 2010 alone, the concentration of VOCs dropped by half, according to a new study by NOAA scientists and colleagues, published in the AGU’s Journal of Geophysical Research. ppbv/ppmv to 10.7
The study found that some of the CO 2 savings made during the use of low carbon vehicles is offset by increased emissions created during their production, and to a lesser extent, disposal. Standard gasoline vehicle. —Greg Archer, LowCVP Managing Director. Vehicle Whole Life Carbon Emissions Analysis. Estimated lifecycle.
At the tailpipe, the TWC ultimately reduced the regulated and unregulated emissions from the methanol-gasoline engine to the same levels as those generated by a conventional gasoline engine. A paper on their study was published online 3 December in the ACS journal Energy & Fuels. —Fan et al.
Global-mean temperature change caused by car exhaust emitted from gasoline and diesel engines specified in the previous and upcoming European vehicle emission standards (EURO 3, 4, 5, and 6). However, previous studies have shown more prolonged warming due to diesel cars under various conditions. Credit: ACS, Tanaka et al.
Contribution of gasoline and diesel exhaust to SOA over 0% to 50% diesel fuel use. The study determined that, depending on a region’s fuel use, diesel exhaust is responsible for 65% to 90% of vehicular-derived SOA, with substantial contributions from aromatic and aliphatic hydrocarbons. Gentner et al. Click to enlarge. Earlier post.).
The study found that the highest-emitting 10% of gasoline vehicles are now responsible for the overwhelming majority of running CO, NMHC, and NO x. However, they also found that decreases in emissions of these pollutants appear to be slowing down and may have leveled off. unmeasured or not reported) from ambient air studies.
Fuel injection timing is the dominant factor affecting particle number (PN) emissions from gasoline direct injection (GDI) engines, with the major factor causing high PN emissions being fuel liquid impingement on the piston bowl, according to a new study by a team from the US National Renewable Energy Laboratory (NREL).
The study’s findings highlight the importance of considering exposures—especially the proximity of emissions to people—when evaluating environmental health impacts for EVs, the team said. note that the focus of their study was motivated in part by the unprecedented rise in popularity of electric two-wheelers in China.
Researchers from the University of Minnesota have produced a spatially and temporally explicit life cycle inventory (LCI) of air pollutants from gasoline, ethanol derived from corn grain, and ethanol from corn stover for the contiguous US (the lower 48 states). The researchers included a sixth pollutant, ammonia (NH 3 ).
A new study by researchers from Stockholm University concludes that automobile tires may be a potential previously unknown source of carcinogenic dibenzopyrenes—a type of high molecular weight polycyclic aromatic hydrocarbon (PAH)—to the environment. Gasoline vehicle exhaust particles contain a factor of 2.3?
The study found that higher ethanol blends—i.e., Overall, this study provides valuable insights on the impacts of ethanol content and gasoline composition on the exhaust emissions from a current technology GDI FFV. Their paper is published in the ACS journal Energy & Fuels. —Yang et al. 8b02206.
Economists view higher gasoline taxes as one solution to reducing gasoline consumption and thus air pollution, greenhouse gas emissions, and reliance on oil, while at the same time providing revenue to the government for highway repair and construction.
OWI Science for Fuels GmbH, TU Bergakademie Freiberg and RWTH Aachen University are investigating Methanol-to-gasoline (MtG) production for opportunities to optimize the process to produce ideal MtG fuels. Synthetically produced methanol-to-gasoline could be a carbon-neutral fuel option for passenger cars.
Their study appears in the ACS journal Environmental Science & Technology. Unlike the results for gasoline vehicles, the measured BC emission factor for heavy-duty diesel vehicles was in reasonable agreement with previous measurements. derived emission factors. Credit: ACS, Liggio et al. Click to enlarge.
The team chose to conduct the study at the provincial level because using national average data might severely underestimate or overestimate results for technologies that primarily operate in designated cities—i.e., Fuel-cycle GHG emissions of EVs, CNGVs, gasoline ICEVs and HEVs. —Huo et al. Credit: ACS, Huo et al.
The California law enabling single-occupant access to the HOV lanes was meant to stimulate sales for fuel-efficient, ultra low-emission vehicles, with the goals of reducing dependence on foreign oil and saving money at the gasoline pump. While adding a single hybrid to any HOV lane at 2 a.m.
A new study suggests that focusing on a gasoline-fueled vehicle’s cold start is the best target for future design changes to reduce emissions of criteria pollutants. The main goal of our project was to find out how effective regulations of gasoline vehicle emissions have been at reducing the formation of smog.
The ORNL team conducted engine experiments with both 91 RON E10 gasoline and liquified petroleum gas (LPG). 1 for LPG only) improved engine efficiency by up to 30% compared with a production turbocharged gasoline direct injection spark ignition engine. higher H/C ratio) than gasoline. Splitter et al. Splitter et al.
The Asian Development Bank (ADB) is providing $300 million towards a project that will replace 100,000 gasoline-burning tricycles in the Philippines with electric tricycles, or E-Trikes. Without intervention, the Philippines is on a course to almost quadruple CO 2 emissions in less than 25 years, the ADB said.
Forty percent of consumers report they are likely to test drive an electric vehicle, according to a new study of online American adults from the Consumer Electronics Association (CEA). According to the study, consumers perceive several disadvantages about electric vehicles. —Chris Ely, CEA's manager of industry analysis.
A new study quantifying emissions from a fleet of gasoline direct injection (GDI) engines and port fuel injection (PFI) engines finds that the measured decrease in CO 2 emissions from GDIs is much greater than the potential climate forcing associated with higher black carbon emissions from GDI engines. —Saliba et al.
Extending, not shortening, the lifetime of a vehicle helps to reduce life-cycle CO 2 emissions throughout the supply chain, according to a new study based on a case study of Japanese vehicle use during the 1990-2000 period published in the ACS journal Environmental Science & Technology. Credit: ACS, Kagawa et al. Click to enlarge.
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