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nitrogen dioxide
noun
: a toxic reddish brown gas NO2 that is a strong oxidizing agent, is produced by combustion (as of fossil fuels), and is an atmospheric pollutant (as in smog)
Examples of nitrogen dioxide in a Sentence
Recent Examples on the Web
Instruments on the aircraft will be measuring carbon dioxide, methane, nitrogen dioxide, formaldehyde and ozone.
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Dillon Mullan, Baltimore Sun, 17 June 2024
Researchers concluded that exposure to nitrogen dioxide emissions alone may contribute to nearly 19,000 premature deaths in the United States each year.
—
Tony Briscoe, Los Angeles Times, 22 May 2024
These calculations are based on the pollutants the EPA detects in the air, including the concentrations of ozone, particulate matter (PM 2.5), carbon monoxide, sulfur dioxide, and nitrogen dioxide.
—
Li Zhou, Vox, 14 May 2024
Phoenix also saw around 83 days with high concentrations of carbon monoxide, nitrogen dioxide or PM2.5 in 2023.
—
Laura Daniella Sepulveda, The Arizona Republic, 4 June 2024
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These examples are programmatically compiled from various online sources to illustrate current usage of the word 'nitrogen dioxide.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.
Word History
First Known Use
1869, in the meaning defined above
Dictionary Entries Near nitrogen dioxide
Cite this Entry
“Nitrogen dioxide.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/nitrogen%20dioxide. Accessed 2 Jul. 2024.
Kids Definition
nitrogen dioxide
noun
: a reddish brown poisonous gas that is an air pollutant formed from automobile exhausts
Medical Definition
nitrogen dioxide
noun
: a poisonous strongly oxidizing reddish brown gas NO2
More from Merriam-Webster on nitrogen dioxide
Britannica.com: Encyclopedia article about nitrogen dioxide
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