Sentences with phrase «oxide of nitrogen»

The vehicles in our fleet produce 97 percent less hydrocarbon and oxides of nitrogen emissions than vehicles that meet today's nationwide top emissions standard.

In the mid-1980s, the company teamed up with another, Lean Burn Associates, to add a second component: a system which recirculates some exhaust gases into the air intake, which reduces emissions of oxides of nitrogen.

Automobiles, power plants and industries release oxides of nitrogen into the atmosphere.

Ozone would increase in concentration all the way to the surface of the planet if it were not for oxides of nitrogen generated largely in soils.

The common rail diesel engines have diesel particulate filters and selective catalytic reduction (SCR) to reduce oxides of nitrogen from the exhaust.

«We show that uptake of atmospheric NH3 (ammonia) onto surfaces containing TiO2 (titanium dioxide) is not a permanent removal process, as previously thought, but rather a photochemical route for generating reactive oxides of nitrogen that play a role in air pollution and are associated with significant health effects,» the authors write.

The top 12 also included three areas of environmental concern: air pollution by oxides of nitrogen and other combustion products; the increase in carbon dioxide levels causing global warming; and urban waste.

Increased levels of ozone at ground level arise through the reaction of volatile organic compounds, for example ethene, with oxygen compounds or oxides of nitrogen in air and under the influence of sunlight.

As the world began to learn in September, when the U.S. Environmental Protection Agency issued a shocking «notice of violation,» the vehicles met emissions standards for dangerous oxides of nitrogen, known collectively as NOx, only when running their paces in an artificial, indoor lab setting.

Results were strongest for fine particulate matter and the traffic - related pollutant gases called oxides of nitrogen.

Using estimated exposure to outdoor oxides of nitrogen at the homes of participants over the year preceding MRI, the authors found that increased exposure to nitrogen dioxide was associated with an approximately 1.0 g (5 percent) increase in right ventricular mass and a 4.1 mL (3 %) increase in right ventricular end - diastolic volume.

His Ford Fiesta ST rallycross car gives off baby - blue oxides of nitrogen, and when subjected to gas chromatography and mass spectrometry, it registers scent compounds closely matching those of the wild Gladiolus orchidiflorus.

«Clean diesel» means the particulates have been cleaned up, specifically oxides of nitrogen (NOx), either via a particulate trap such as the one on the VW Jetta TDI wagon tested by West Virginia University researcher / engineer Daniel Carder or with a trap supplemented by a liquid urea exhaust after - treatment system that has to be refilled every 10,000 miles or so, as in the Passat TDI he also tested.

A DeNox catalytic converter in the exhaust system reduces the remaining oxides of nitrogen by means of an additive.

The high - mileage D4 direct - injection gasoline engine remains too expensive and emits too much oxides of nitrogen to meet U.S. emissions regulations.

Nitrogen atoms are highly reactive with O2, creating oxides of nitrogen.

The Code notes that shutting down an engine during taxi - in operations can deliver reductions of 20 to 40 per cent of the ground level fuel burn and CO2 emissions, and 10 to 30 per cent of ground emitted oxides of nitrogen (NOx) emissions, depending on aircraft type and operator technique.

A further technical breakthrough is the actual exhaust aftertreatment system, which cuts emissions of oxides of nitrogen (NOx) by as much as 90 percent.

Our hybrid driving school vehicles produce 97 percent less hydrocarbon and oxides of nitrogen emissions than vehicles that meet the top national emissions standard.

GM says it will use selective catalytic reduction or urea to reduce oxides of nitrogen or NOx emissions so that the Duramax can continue to be sold in all 50 states and meet new tier 2, bin 5 emissions levels.

Yet they are still active, chemical reactors really, generating hydrogen and various toxic gases such as oxides of nitrogen and organic vapours.

«We show that uptake of atmospheric NH3 (ammonia) onto surfaces containing TiO2 (titanium dioxide) is not a permanent removal process, as previously thought, but rather a photochemical route for generating reactive oxides of nitrogen that play a role in air pollution and are associated with significant health effects,» the authors write.

The EU National Emission Ceilings Directive sets ceilings for each Member State for emissions of ammonia, oxides of nitrogen, sulphur dioxide and volatile organic compounds (VOCs).

«Particulates, ozone, oxides of nitrogen and sulfur — they all have strong biological mechanisms for making asthma worse,» said Dr. Rob McConnell, an asthma researcher at the University of Southern California.

In addition to air pollution data from state and local air agencies, these MESA Air monitors collected and measured variable levels of PM2.5, oxides of nitrogen, and black carbon, among other pollutants over two - week periods between 2005 - 2009.

The study found that for every 5 µg / m3 higher concentration of PM2.5, or 35 parts per billion higher concentration of oxides of nitrogen — about the difference between more and less polluted areas of a U.S. metropolitan area — individuals had a 4 Agatston units / year faster rate of progression of coronary artery calcium scores.

At the same time, the burning of ever - increasing quantities of coal, oil and natural gas converts some atmospheric nitrogen into oxides of nitrogen (NOx).

The offending emissions are oxides of nitrogen (NOx), hydrocarbons (HC) and carbon monoxide (CO).

Under lean operating conditions, these converters adsorb the oxides of nitrogen.

With the combination of a NOx oxidating catalytic converter and a downstream SCR catalytic converter, which is integrated into the diesel particulate filter and uses AdBlue injection to reduce oxides of nitrogen, the V8 TDI has a particularly efficient emissions control system.

In the hot exhaust gas, the solution breaks down into ammonia, which splits the oxides of nitrogen into nitrogen and water.

Oxides of nitrogen and soot are both lower than in a conventional diesel without requiring urea injection.

Mass production of Diesel Particulate - NOx Reduction (DPNR) system, the world's first system for simultaneously reducing diesel particulate matter and oxides of nitrogen, adopted in the 1CD - FTV engine

With the combination of a NOx oxidizing catalytic converter and a downstream SCR catalytic converter, which is integrated into the diesel particulate filter and uses AdBlue injection to reduce oxides of nitrogen, the V8 TDI has an efficient emissions control system.

Its revolutionary catalytic converter reduces emissions of oxides of nitrogen (NOx) to match those of a petrol engine.

The gases responsible for creating low - level ozone are carbon monoxide, the oxides of nitrogen (all found in car exhaust fumes), methane, and other hydrocarbons.

Green freight programs work with the freight industry to minimize the public health impacts of diesel emissions by promoting technologies that reduce emissions from the combustion of diesel, including particulate matter (PM) and oxides of nitrogen (NOx), which benefits the health of vulnerable populations.

This is due to a combination of particulate matter, sulphur dioxide and oxides of nitrogen that are released into the atmosphere when coal is burned.

They do not have catalytic converters and their emissions of unburned hydrocarbons, oxides of nitrogen, particulate matter, and carbon monoxide are quite high.

There are usually several additional byproducts like carbonmonoxide, ash, ozone and oxides of nitrogen.

(``... oxides of nitrogen are formed in internal combustion engines that can be deposited as nitrates also contributing to fertilization of plant materials.»)

NOx is a term for the arithmetic sum of oxides of nitrogen (principally NO and NO2) per U.S. federal emissions regulations.

The EPA regulates diesel marine engines, which are «among the highest contributors of hydrocarbons (HC) and oxides of nitrogen (NOx) emissions in many areas of the country,» adding to both air and water pollution.