nitrogen oxide


Definition of nitrogen oxide 

: any of several oxides of nitrogen most of which are produced in combustion and are considered to be atmospheric pollutants: such as

a : nitric oxide

b : nitrogen dioxide

c : nitrous oxide

Examples of nitrogen oxide in a Sentence

Recent Examples on the Web

Under actual driving conditions, the vehicles produced much more lung-damaging nitrogen oxides than allowed by law. Jack Ewing, New York Times, "Volkswagen Agrees to $1.2 Billion German Fine in Emissions-Cheating Scheme," 13 June 2018 It is intended to mitigate emissions of harmful air pollutants called nitrogen oxides from the polluting diesel vehicles, many of which have been taken off the road after Volkswagen bought them back. Kate Galbraith, San Francisco Chronicle, "California regulators approve $423 million for clean transportation," 25 May 2018 State officials figure the Volkswagen diesel emissions testing scandal added an extra 10,000 tons of noxious nitrogen oxide to California's air. Russ Mitchell,, "VW funds from diesel scandal will pay for zero-emission buses, trucks in California," 26 May 2018 Out on the open road, a different engine management map would be in charge, resulting in high levels of nitrogen oxide (NOx) pollutants coming out in the exhaust. Jonathan M. Gitlin, Ars Technica, "Bosch might just have solved the problem of diesel NOx emissions," 27 Apr. 2018 Burning heavy fuel oil, the industry produces 13% of the world’s sulphur emissions and 15% of its nitrogen oxides. The Economist, "A wave of new environmental laws is scaring shipowners," 21 June 2018 Air pollution levels after closing decreased to an average of four tons of nitrogen oxides per year from 177 tons before. Nicholas Bakalar, New York Times, "Air Pollution Near Power Plants Tied to Premature Births," 22 May 2018 The second problem is emissions of harmful nitrogen oxides and particulates from vehicles. The Economist, "Heathrow’s third runway could be blown off course by pollution," 28 June 2018 That includes carbon monoxide, nitrogen oxides and particulate matter — those nasty tiny particles of metals that get deep in the lungs. Sarah Bowman, Indianapolis Star, "The Indy 500 is actually super trashy," 21 May 2018

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'nitrogen oxide.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of nitrogen oxide

1868, in the meaning defined above

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Last Updated

17 Sep 2018

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The first known use of nitrogen oxide was in 1868

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