Definition of nitrogen dioxide in English:

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nitrogen dioxide

Pronunciation: /ˈnītrəjən dīˈäkˌsīd/


A reddish-brown poisonous gas used in the manufacture of nitric acid. It is also an air pollutant, a constituent of untreated automobile exhaust.
  • Chemical formula: NO2. It usually exists in equilibrium with dinitrogen tetroxide, N2O4.
Example sentences
  • Levels of nitric oxide, nitrogen dioxide and sulphur dioxide remained at a normally low level.
  • Increases in ozone, sulphur dioxide, nitrogen dioxide and carbon monoxide are blamed primarily on the motorist.
  • Free radicals such as nitric oxide and nitrogen dioxide show weak attractions toward magnetic fields - they are called paramagnetic.

For editors and proofreaders

Syllabification: ni·tro·gen di·ox·ide

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