NOx | Wikipedia audio article
Channel: wikipedia tts
Date: 04/10/2019

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/NOx


00:01:54 1 Formation and reactions
00:03:32 1.1 Formation of smog
00:03:52 1.2 Formation of nitric acid and acid rain
00:04:47 2 Sources
00:06:33 2.1 Natural sources
00:06:43 2.2 Biogenic sources
00:09:04 2.3 Industrial sources (anthropogenic sources)
00:11:34 2.3.1 Thermal
00:12:40 2.3.2 Fuel
00:14:10 2.3.3 Prompt
00:15:53 3 Health and environment effects
00:16:49 4 Biodiesel and spanNOspan ix/i 
00:21:57 5 Regulation and emission control technologies
00:24:31 6 References



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SUMMARY
=======
In atmospheric chemistry, NO x  is a generic term for the nitrogen oxides that are most relevant for air pollution, namely nitric oxide (NO) and nitrogen dioxide (NO 2 ).  These gases contribute to the formation of smog and acid rain, as well as affecting tropospheric ozone.
NO x  gases are usually produced from the reaction among nitrogen and oxygen during combustion of fuels, such as hydrocarbons, in air; especially at high temperatures, such as occur in car engines. In areas of high motor vehicle traffic, such as in large cities, the nitrogen oxides emitted can be a significant source of air pollution. NO x  gases are also produced naturally by lightning.
The term NO x  is chemistry shorthand for molecules containing one nitrogen and one or more oxygen atom.  It is generally meant to include nitrous oxide (N2O), although nitrous oxide is a fairly inert oxide of nitrogen that has many uses as an oxidizer for rockets and car engines, an anesthetic, and a propellant for aerosol sprays and whipped cream.  Nitrous oxide plays hardly any role in air pollution, although it may have a significant impact on the ozone layer, and is a significant greenhouse gas.
NO y  is defined as the sum of NO x  plus the NO z  compounds produced from the oxidation of NO x  which include nitric acid, nitrous acid (HONO), dinitrogen pentoxide (N2O5), peroxyacetyl nitrate (PAN), alkyl nitrates (RONO2), peroxyalkyl nitrates (ROONO2), the nitrate radical (NO3), and peroxynitric acid (HNO4).