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Carbon
Monoxide | Hydrocarbons
Nitrogen
Oxides | Particulate
Matter 
Nitrogen oxides form when fuel
burns at high temperatures, such as in motor vehicle engines. Mobile
sources are responsible for more than half of all nitrogen oxide emissions
in the United States. Both on-road and nonroad mobile sources are
major nitrogen oxide polluters
1999 National Emissions by
Source:
Nitrogen Oxides
Nitrogen oxides can travel long distances, causing a variety of
health and environmental problems in locations far from their
emissions source. These problems include ozone
and smog,
which are created in the atmosphere from nitrogen oxides, hydrocarbons,
and sunlight. On smoggy days, you might notice difficulty breathing
or trouble seeing objects in the distance. Nitrogen oxide emissions
also contribute to the formation of particulate
matter through chemical reactions in the atmosphere.
Learn more about
nitrogen oxides and ground-level
ozone, the major component of smog. Also, find out about nitrogen oxide levels
where you live. |
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