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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. Emission factors (EFs) from scooters and other vehicles.
For the first time, preliminary data recently reported to the EEA by Member States allow a comparison with the legally binding emission limits for 2010 set in the EU NEC Directive. These pollutants can cause respiratory problems, contribute to the acidification of soil and surface water, and damage vegetation. Jacqueline McGlade.
The European Community’s air pollutant emission inventory report released by the European Environment Agency finds that in 2007, sulphur oxides (SO x ) emissions were down by 72 % from 1990 levels. EU-27 emissions of all four pollutants were lower in 2007 than in 2006.
Levels of two major air pollutants have been reduced significantly since lockdowns began in response to the COVID-19 pandemic, but a secondary pollutant—ground-level ozone—has increased in China, according to new research. For comparison, columns over the same time periods are shown for 2019.
Both fine-particle air pollution and noise pollution may increase a person’s risk of developing cardiovascular disease, according to German researchers who have conducted a large population study, in which both factors were considered simultaneously. —Barbara Hoffmann, MD, MPH, study leader. 32.8%) per 2.4µg/m 3. (As
The high concentrations found in snow samples from disparate regions suggest microplastics—which may contain varnish, rubber, or chemicals used in synthetic fabrics—cause significant air pollution. For comparison, the researchers investigated samples from the remote Swiss Alps and the City of Bremen in northwest Germany.
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.
In addition to a range of up to 1000 km, the coach reduces CO 2 emissions by 25%, NO x emissions by 85% and particle pollution by 96%, minimizing criteria pollutant emissions that affect health to nearly zero. In comparison with CNG (compressed natural gas), LNG takes up less space (600 times less), it has an energy density 1.4
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 L/2002 calibration and 6.4
The first real-world, head-to-head comparison of improved cookstoves (ICs) and traditional mud stoves has found that some ICs may at times emit more of the black carbon particles that are linked to serious health and environmental concerns than traditional mud stoves or open-cook fires.
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.
In comparison, to meet upcoming Euro 6 standards beginning in September this year, at least 20 sensors are needed—depending on the engine. As a pollutant, NO x has long been a stronger focus for US legislation, which also dictates that the emission parameters are measured under realistic driving cycle conditions.
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.
Second, they found that while much of the air pollution policies have focused to date on the electricity sector, damages from farms are now larger than those from utilities. Indeed, farms have become the largest contributor to air pollution damages from PM2.5 related emissions. Tschofen et al. —Tschofen et al. 1905030116.
However, aerosols have a much shorter lifespan in the atmosphere than the gases responsible for global warming, resulting in an atmospheric distribution that varies by region, especially in comparison to carbon dioxide. For example, aerosols from India cool their country of origin 20 times more than they cool the planet.
Comparisons of life-cycle emissions from LUC phase for (a) sugar cane ethanol and (b) soybean biodiesel. The pollutants are NMHC, CO, NO x , TPM, PM 2.5 The climate effects of land-use changes from increasing biofeedstock acreage, both indirect and direct, have dominated policy discussion, and focused on comparisons in long-lived GHGs.
A report published by the California Air Resources Board (CARB), in consultation with the California Energy Commission (CEC), shows California investments to clean up old, polluting school buses have already exceeded $1.2 The Legislature has appropriated an additional $1.8
At last week’s Ocean Innovation 2009 conference in Victoria, British Columbia, Craig Carter, Director of Marketing and Customer Service at Thordon Bearings detailed the company’s progress in the retrofitting of large ocean-going vessels with seawater-lubricated propeller shaft bearings to reduce waterborne pollution.
Setback distances should be revisited to address temporal variability and pollution controls in vent emissions. By comparison, the California Air Pollution Control Officers Association (CAPCOA) used an estimate of 0.11 —Hilpert et al. Gasoline vapors contain a number of toxic chemicals—notably benzene, a carcinogen.
In a similar way, the full breadth of impacts attributable to conventional gasoline production, such as natural resource consumption and hazardous pollutant emissions, must also be considered in order to make balanced comparisons to biofuels. This study highlighted the environmental impacts of corn ethanol in comparison with gasoline.
Renault’s comparison of the carbon footprint of EV and ICE vehicles over production, operation and end of life. The publication gives the opportunity for an “apples-to-apples” comparison between the environmental impacts of the two types of powertrains: same manufacturer, same model, same boundary conditions. Click to enlarge.
The second proposed label retains the current label’s focus on miles per gallon (MPG) and annual fuel costs, while updating the overall design and adding the required new comparison information on fuel economy and emissions. Comparable Fuel Economy: A comparison of the vehicle’s fuel economy to that of comparable vehicles.
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. The magnitude of the drop in VOC levels was surprising, even to researchers who expected some kind of decrease resulting from California’s longtime efforts to control vehicle pollution. ppbv/ppmv to 10.7
Every air pollutant is more than 90% its limit. The two vehicles were less than one year old, had their original tires with similar tread depths, and closely matched mileage. The Tesla is physically slightly larger, and weighs 489 kg (1,078 lbs) more, due mainly to the battery pack.
These findings led the researchers to conclude that even at current environmental levels of tire-related pollution, which are expected to increase, aquatic ecosystems may be experiencing negative impacts. Exposure to nano tire particles enhanced toxicity in comparison to leachate alone. Credit: John Dickens.
Using biodiesel in construction vehicles offers promising environmental benefits in terms of reduced tailpipe emissions as well as reductions in fuel cycle emissions of selected pollutants, according to a new study by researchers at North Carolina State University.
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.
Although EVs have a greater GHG reduction benefit than CNGVs, they may increase life-cycle emissions of criteria pollutants, simply because coal is heavily involved. The original reason for developing EVs and CNGVs is to substitute oil, not to reduce emissions of GHGs or any pollutant. —Huo et al. Credit: ACS, Huo et al.
Outlines the approach for collecting and analyzing the data needed to evaluate the indicator and for making relevant comparisons to other energy options or agricultural systems. Emissions of non- GHG air pollutants, including air toxics. Provides information on data limitations and highlights potential bottlenecks to data acquisition.
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 current iSPEX-EU project, which runs until 15 October, is a scaled-up version of the original iSPEX-project that enlisted the general public to contribute to the understanding of air pollution. Participating cities include: Athens, Barcelona, Belgrade, Berlin, Copenhagen, London, Manchester, Milan, and Rome. iSPEX add-on.
EVs offer advantages in terms of powertrain efficiency, maintenance requirements, and zero tailpipe emissions, the last of which contributes to reducing urban air pollution relative to conventional internal combustion engine vehicles (ICEVs). This has led to a general perception of EVs as an environmentally benign technology.
Comparison of aggregated EU-27 emission projections and ceilings reported in 2010. The EU-27 and its Member States must meet legally binding limits for four air pollutants set by the National Emission Ceilings Directive (NEC Directive). Most Member States also anticipate meeting their emission ceilings for these pollutants.
The tool shows not only the calculation of all greenhouse gases—added together and expressed in CO 2 equivalents—but also those for the release of particulates, harmful nitrogen oxide emissions, and all of the usual environmental assessment indicators such as pollution of water bodies.
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.
As a result of their findings, published in the 30 October issue of the journal Science , the authors argue that assessments of multigas mitigation policies, as well as any separate efforts to mitigate warming from short-lived pollutants, should include gas-aerosol interactions. Similar reactions influence the creation of nitrate aerosols.
Battery electric cars emit less greenhouse gases and air pollutants over their entire life cycle than petrol and diesel cars, according to a European Environment Agency (EEA) report. Shifting to electric vehicles could also reduce noise pollution, especially in cities where speeds are generally low and traffic often stands still.
In contrast, no decrease in sulfur dioxide was observed in the Mediterranean harbor of Tunis, and there was no reduction in any of the other air pollutants that were measured in all four harbors (Civitavecchia, Savona, Palma de Mallorca and Tunis). By comparison, the sulphur content of fuels used in road vehicles must not exceed 0.001%.
According to NGVAmerica, the New Delhi Natural Gas Vehicle Program has halved the air pollution in comparison to ten years ago. A decade later, the government has issued a report hailing the success of the program, showing that, while the number of vehicles on the road has doubled, the pollution rate has halved.
Based on a three-year study of toxic and environmentally relevant pollutants from gasoline direct injection (GDI) engines, Swiss researchers have concluded that some GDI engines emit just as many soot particles as unfiltered diesel cars did in the past. Further, the GDI particles carry numerous carcinogenic substances.
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) with cooled exhaust gas recirculation (EGR) and high compression ratio (13.3:1 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. This allows for more efficient conversion of pollutants in the catalyst and reduced NO x , at no additional after treatment hardware cost. Source: Tula. Additional synergies can be gained by coupling dDSF with hybridization.
New methods of testing and simulating air quality should be considered in order to help policy makers have a more accurate understanding of how emissions affect air pollution levels, new research suggests. The researchers compared current techniques used to describe atmospheric chemical reactions against more historical techniques.
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.
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