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
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Gas cooking emits toxic chemicals like benzene, a carcinogen, and nitrogen dioxide, a respiratory irritant that can exacerbate asthma, cardiopulmonary disease and other conditions. Rachel Nuwer, New York Times, 7 Apr. 2025 But the facts accrued through existing research cannot be erased: People of color in the U.S. are exposed to a 38 percent higher level of the respiratory irritant nitrogen dioxide, on average, than white people. Zoë Schlanger, The Atlantic, 7 Mar. 2025 In their new study, the SETI Institute astronomers focused on the remote detection of nitrogen dioxide, or NO2, a conspicuous by-product of fossil-fuel burning. Phil Plait, Scientific American, 27 Feb. 2025 These include volatile organic compounds such as formaldehyde, air pollutants such as nitrogen dioxide, consumer chemicals such as bisphenol A, and herbicides such as atrazine. Brad Reisfeld, The Conversation, 12 Mar. 2025 See All Example Sentences for nitrogen dioxide

Word History

First Known Use

1869, in the meaning defined above

Time Traveler
The first known use of nitrogen dioxide was in 1869

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Cite this Entry

“Nitrogen dioxide.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/nitrogen%20dioxide. Accessed 15 Apr. 2025.

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

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