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
- 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.
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Syllabification: ni·tro·gen di·ox·ide
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