Reference Terms
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Nitrogen oxide

NOx is a generic term for the various nitrogen oxides produced during combustion.

They are believed to aggravate asthmatic conditions, react with the oxygen in the air to produce ozone, which is also an irritant and eventually form nitric acid when dissolved in water.

When dissolved in atmospheric moisture the result can be acid rain which can damage both trees and entire forest ecosystems.

Note:   The above text is excerpted from the Wikipedia article "Nitrogen oxide", which has been released under the GNU Free Documentation License.
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