nitrogen oxides

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nitrogen oxides

[¦nī·trə·jən ′äk‚sīdz]
(inorganic chemistry)
NO x Chemical compounds of nitrogen and oxygen; produced primarily from the combustion of fossil fuels, they contribute to the formation of ground-level ozone.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
Nitrogen oxide or NOx is a key contributor to air pollution in the forms of smog and fine particulate matter.
After the monthly UDCA therapy we revealed the reduction of nitrogen oxide metabolites, however, in the 2 group of significant changes have not been noted, in this connection the patients with the presence of the G allele additionally was administered pentoxifylline 800 mg/day for 2 months.
However, the most modern and efficient diesel engines burning biodiesel emit up to 40 percent more nitrogen oxides at some operating conditions, and fuel economy declines by as much as 20 percent.
Emission & Power Solutions Plc (Emission & Power Solutions) (Euronext:EPI), a clean tech company that licences, acquires, develops, deploys, and transfers technologies dedicated to improving fuel economy, has received an initial purchase order for its Nitrogen Oxide sensor from Amelti Systems AS, a Vestfold, Norway based manufacturer of industrial engine and vehicle fleet monitoring and management systems.
The settlement resolves the EPA's claims that on two separate occasions, in 1997 and 2000, Cemex violated the Clean Air Act by undertaking major plant modifications resulting in significant increases in the Victorville plant's capacity to pollute without first undergoing required regulatory review or obtaining required permits under the Clean Air Act's Prevention of Significant Deterioration, or PSD, program and without installing state-of-the-art emission controls that would reduce contaminants such as nitrogen oxide.
Of the two offending facilities, the Sendai plant in Kagoshima is suspected of having emitted a maximum amount of nitrogen oxide which was 10 percent more than the limit stipulated by the law for a total of 33 hours during a two-year period from July 2005, according to a probe conducted between July 10 and 19 by the midsize paper manufacturer.
Denso's common rail system limits particulate matter and nitrogen oxide emissions by electronically controlling fuel injection in a highly precise manner, it added.
The first Clean TDI with a nitrogen oxide post-treatment system will be available during 2008 in America, so nitrogen oxide will be reduced to no more than70mg per mile.
First it converts part of the exhaust gas into ammonia and then uses the ammonia to convert nitrogen oxide to harmless nitrogen.
Eschbach says the silence of fuel cells is an important benefit for stealth destroyers, but it also helps that these power sources are more efficient (47% electrical efficiency--the portion of total energy in the reaction that is translated into usable electrical power--compared to 30-40% for diesel engines) and 99% cleaner, especially in terms of nitrogen oxide, sulfur oxide, and particulate emissions.
They can be emitted directly from diesel engines and wood fires or created indirectly in the atmosphere by the interaction of ammonia, water vapor, and other gases with sulfur dioxide and nitrogen oxide, two pollutants primarily released by industry and cars.
The reduction in air pollution includes cutting toxic particulate emissions by an estimated 21 tons per year and smog-forming nitrogen oxide emissions (NOx) by 226 tons per year.