gaseous compound that results from the high temperatures in internal combustion engines. which in rum causes atmospheric nitrogen to combine with oxygen. Nitrogen oxide (N ) is one of the major components of acid rain.
Merriam-Webster Online Dictionarynitrogen oxide (noun)
any of several oxides of nitrogen most of which are produced in combustion and are considered to be atmospheric pollutants as
a) - nitric oxide
b) - nitrogen dioxide
c) - nitrous oxide
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nitrogen oxide (Wikipedia)