This site uses cookies to improve your experience. To help us insure we adhere to various privacy regulations, please select your country/region of residence. If you do not select a country, we will assume you are from the United States. Select your Cookie Settings or view our Privacy Policy and Terms of Use.
Cookie Settings
Cookies and similar technologies are used on this website for proper function of the website, for tracking performance analytics and for marketing purposes. We and some of our third-party providers may use cookie data for various purposes. Please review the cookie settings below and choose your preference.
Used for the proper function of the website
Used for monitoring website traffic and interactions
Cookie Settings
Cookies and similar technologies are used on this website for proper function of the website, for tracking performance analytics and for marketing purposes. We and some of our third-party providers may use cookie data for various purposes. Please review the cookie settings below and choose your preference.
Strictly Necessary: Used for the proper function of the website
Performance/Analytics: Used for monitoring website traffic and interactions
They found that the level of emissions of regulated and unregulated pollutants in diesel exhaust depends on fuel, load, engine calibration, and exhaust aftertreatment technology. Unregulated pollutants also include ozone precursors and bioaccumulative and toxic compounds. L) and medium-duty (6.4 —Chin et al.
The transient results illustrate the gradual formation of the nucleation mode particles with continuous increase in exhaust temperatures. The particle number count under those conditions increased by more than an order of magnitude in comparison to DPF-out particle concentrations. Credit: ACS, Thiruvengadam et al. Click to enlarge.
A new briefing paper from Imperial College London estimates that in 2021, 52% of all small particle pollution from road transport came from tires and brakes. Despite this, research on the environmental and health impacts of tire wear has been neglected in comparison to the research and innovations dedicated to tackling fuel emissions.
Our findings add to evidence that subways expose millions of commuters and transit employees to air pollutants at levels known to pose serious health risks over time. By comparison, aboveground air concentrations for all measured cities averaged just 16 ?g/m g/m 3 ), followed by the MTA New York at 251 ?g/m
On 30 December, the city government of Shenzhen, China announced that it will only issue 100,000 license plates per year via lotteries and auctions, with immediate effect, to fight congestion and pollution. For comparison, New York City in 2013 had a population of 8.4 By the end of 2013, it had 10.63 million permanent residents.
New research from Chalmers University of Technology, Sweden, finds that the discharge water from ships’ exhaust gas treatment systems—i.e., Comparison of loads (kg/year) of PAHs from direct discharges from ships and atmospheric deposition to the Baltic Sea. Marine Pollution Bulletin , Volume 182, doi: 10.1016/j.marpolbul.2022.113904.
Comparison of optimized start of injection of advanced diesel combustion for brake thermal efficiency, NO x , PM, THC, and CO of diesel (open bar); HTFT (gray bar); and LTFT (black bar) fuels. Credit: ACS, Lilik and Boehman. Click to enlarge.
In part it is difficult to identify significant air quality improvements from a specific program—especially one targeted at a small area within a large city—against the backdrop of broader regional pollutant and weather changes. Within the CCZ, the investigators projected a net decline of 1.7 µg/m 3. in PM 10.
Exposure to air pollution on city streets is enough to counter the beneficial health effects of exercise in adults over 60, according to new research led by Imperial College London and Duke University. Our research suggests that we might advise older adults to walk in green spaces, away from built-up areas and pollution from traffic.
1) with cooled exhaust gas recirculation (EGR) and high compression ratio (13.3:1 Comparison of the derived brake thermal efficiency of the ORNL research engine (LSE) running LPG to 2019 production Cummins ISB diesel. The unique high stroke-to-bore engine design (1.5:1) 1 for both fuels, with additional runs at 16.8:1 Splitter et al.
Comparison of baseline and dDSF CO 2 and NO x on HD FTP cycle and LLC. Cylinder deactivation also reduces excess engine airflow, increasing exhaust temperatures. This allows for more efficient conversion of pollutants in the catalyst and reduced NO x , at no additional after treatment hardware cost. Source: Tula.
This puffy line is not just exhaust from the engine, but a change in the clouds that’s caused by small airborne particles of pollution. Pollution from ships creates lines of clouds that can stretch hundreds of miles. The difference helps explain how much industrial pollution influences clouds. NASA Earth Observatory.
Exposure to these pollutants was most elevated in the coach located closest to the locomotive: geometric means were 126,000# cm -3 for UFP, 249 μm 2 cm −3 for LDSA, and 17,800 ng m −3 of BC; these concentrations are much higher than those previously reported for other modes of public transportation.
This newly developed ENSs could improve low-temperature automobile exhaust treatment. Meanwhile, hydrocarbons, such as propylene (C 3 H 6 ) and propane (C 3 H 8 ) are typical automobile exhaust gas pollutants and must be converted to carbon dioxide (CO 2 ) and water (H 2 O) before they are released as exhaust.
What initially motivated the Berlin Fire Department’s concluded tendering procedure were the growing demands with regard to environmental protection and the complex exhaust systems of conventional chassis, which are having an increasingly negative effect on the design and operation of firefighting vehicles.
The system uses absorption spectroscopy to monitor and record emissions from a vehicle’s exhaust as it passes by a road-side sensor. This data promises to play an important role in providing cities and local authorities with the insight they need to develop Clean Air Zones and other air pollution mitigation measures.
However, the impact of these changes in HDDV exhaust emissions on ambient atmospheric pollutant concentrations and, more importantly, on human health outcomes across Canada have not been evaluated. exhaust emission control devices and vehicle efficiency) outweigh changes in emissions associated with the use of blends lower than B20.
The chemistry of a fuel impacts the emissions from an engine, with the most obvious example being unburned or partially burned fuel which is a major component of engine exhaust. Engine-out exhaust contains typically 1?3% via the unburned or partially burned fuel which is a major component of engine exhaust. —Hubbard et al.
Comparison of O 3. In comparison to other iron oxide materials, it has a particularly high proportion of unsaturated and thus reactive iron centers on its surface. Ozone (O 3 ) is a dangerous air pollutant that is highly reactive and causes both short- and long-term adverse health effect and also disrupts plant growth.
Exposure to these pollutants caused increased signs of oxidative stress and inflammation in the cells, and hard braking caused most exposure. A direct comparison to other (model) particles known to cause these stress effects in vitro was not done, so comparative statements cannot yet be made.
The TUM team investigated the behavior of OMEs in engines, the adjustments required to improve combustion efficiency and the degree to which harmful emissions can be reduced in comparison to fossil fuels. We determined that using this fuel can significantly reduce pollutant emissions. Martin Härtl, who coordinates the project.
Stuart Grange works in Empa’s Air Pollution/Environmental Technology Laboratory and also at the Wolfson Atmospheric Chemistry Laboratories at the University of York. Together with his colleagues, he used a special instrument to examine the exhaust plumes of 23,000 passing cars and analyzed the levels of NO x and CO 2.
In comparison, the composite US freight line-haul fleet, which consumes 90% of the fuel in the rail industry, emits 8 g/bhp-hr of NO x while new CNG Class 8 trucks emit 0.02 In comparison, OptiFuel’s 4,300 RNG hybrid line-haul locomotive is expected to emit 0.04 g/bhp-hr of NOx, a reduction of 400 times. g/bhp-hr of PM.
This SBIR Phase I project will apply certain aspects of Eltron’s new catalytic technology for reagent-free abatement of nitrogen oxides (which provides both direct decomposition and passive lean reduction activity) to off-road diesel engine exhaust. A number of NO x abatement technologies (e.g.,
Recent studies have compared emissions of PFI and GDI vehicles, including particle number and mass, gaseous pollutants, and nonmethane organic gas (NMOG) composition for a limited number of compounds. Therefore, the secondary organic aerosol and ozone formation potential of the exhaust does not depend on engine technology. May, Greg T.
used global composition-climate modelling to examine the integrated impacts of adopting stringent European on-road vehicle-emission standards for non-CO 2 pollutants in 2015 in many developing countries. In comparison, the Northern Hemisphere has warmed by about 0.3°C Shindell et al. trillion avoided health damage and $US1.1-4.3
However, only a small fraction of SOA formed during photo-oxidation of dilute LDGV exhaust in a smog chamber is explained by single-ring aromatic compounds. The relationships between IVOCs and other pollutants were examined to develop methods for estimating IVOC emissions from existing data. Gordon et al. —Zhao et al.
Earlier work by members of the team (Gregory Lilik and André Boehman) had shown that high cetane number fuel with HECC leads to reductions in all primary pollutant emissions—i.e., THC and CO as well as NO x and PM. Earlier post.) Less established, however, is how well such dilute combustion processes influence soot formation.
The result is a compendium of experimental data regarding the regulated gaseous pollutants and fuel consumption on 21 vehicles. This seems to suggest a general trend: for those pollutants whose emissions are mainly due to the cold start phase of the cycle (ex.
Marion, OH Most people have heard of exhaust emissions, but there is another form of emissions released by vehicles known as non-exhaust emissions (NEEs). Leachate was considered the main driver of toxicity in both organisms, with the particles themselves enhancing the toxicity in comparison to the leachate alone.
However, prior to the remarks on climate change and the regulatory response, he spent a few minutes discussing the efforts on urban pollution—e.g., What more is need to end urban pollution, something we’ve been spending over 30 years working on? Comparison of Emission Standards (g/mi). . smog and particulates. Tim Johnson.
The new six-cylinder in-line engine comes with an intelligent form of turbocharging: assisted by the ISG at start-off, the electric auxiliary compressor (eZV) guarantees immediate high torque when driving off and accelerating, bridging the time before the large exhaust turbocharger cuts in.
All the while, Russell and her team used instruments installed on board to continuously measure pollutants such as carbon monoxide (CO) and nitrogen oxides (NO x ), organic and black carbon aerosols, and engine performance to characterize differences between conventional and renewable fuels.
The only reason we used gasoline was for comparison; it wasn’t necessary. As comparison, again excluding private stations, there are 298 biodiesel stations; 8,485 electric plug-in stations; 2,391 E85 stations; 12 hydrogen stations, 56 LNG stations, and 2,718 LPG stations. The exhaust ports are also designed for greater flow.
Globally, the automotive industry is being driven to provide more fuel efficient, less polluting and more electrified vehicles primarily by regulatory pressures, although consumer demand is playing its part as well. The auto industry has known for a long time that business-as-usual was literally unsustainable.
The researchers used the West LA data as a baseline for comparison with the high-mileage fleet measurements. They used remote vehicle exhaust sensors to collect emissions measurements, and recorded a video image of the license plate of each vehicle. In their study, Bishop et al.
All Tesla cars do not emit zero exhaust gas pollutants, making the Clean Air index an easy win for the Model 3. In comparison, it would be challenging to decarbonize gas car production and lifetime since carbon capture is not economically viable. . The Tesla car received a 10/10 score in the Clean Air index.
Here are a few major reasons Environmental Awareness Since electric vehicles produce no exhaust, they help to reduce greenhouse gas emissions and air pollution. You May Also Like [READ]: Solid state Batteries v/s Li-ion Batteries: A Comparison Based on Cost [READ]: EVs & Camping: How Well They Go Along ?
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.
The global market for sensors used in internal combustion engines (ICE) is on the road of steady growth for the next few years, propelled by increasing utilization in engine management and exhaust aftertreatment, according to a new report from IHS Technology. IHS projects that sensor shipments for ICEs will top 1.34 billion in 2013.
Comparison of brake thermal efficiency and specific fuel consumption at rated power (ICOMIA Mode 5), hydrogen vs. gasoline engines. It, or a scaled-up version, could also provide a solution for the Asian motor vehicle fleet, in which two-stroke engine vehicles constitute a major share—and contribute significantly to air pollution.
Comparison of the potential reduction in emissions with the application of lower sulfur 0.5% While that report projected vessel activity, it did not explore the environmental impacts of increased shipping in terms of air emissions or the potential climate impacts from increases in short-lived climate pollutants such as black carbon.
The study—a component of the Advanced Collaborative Engine Study (ACES)—is exposing rats and mice for 16 hours a day to emissions from a heavy duty diesel engine meeting 2007 US EPA standards that reduce emissions of fine particles and other pollutants by more than 90% from levels emitted by older engines.
The researchers first quantified carbonaceous PM from Euro 5 gasoline and DPF-equipped diesel cars, then constrained the measurements using source apportionment investigations to provide a comprehensive assessment of the current state and future trends in gasoline and diesel vehicular pollution.
We organize all of the trending information in your field so you don't have to. Join 5,000+ users and stay up to date on the latest articles your peers are reading.
You know about us, now we want to get to know you!
Let's personalize your content
Let's get even more personalized
We recognize your account from another site in our network, please click 'Send Email' below to continue with verifying your account and setting a password.
Let's personalize your content