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<div>'''Atmospheric chemistry''' is a branch of [[atmospheric science]] in which the [[chemistry]] of the [[Earth's atmosphere]] and that of other planets is studied. It is a [[multidisciplinary]] field of research and draws on chemistry, [[physics]], [[meteorology]], [[computer modeling]], [[oceanography]], [[geology]] and [[volcanology]] and other disciplines. Research is increasingly connected with other areas of study such as [[climatology]].<br />
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The composition and chemistry of the atmosphere is of importance for several reasons, but primarily because of the interactions between the atmosphere and living organisms. The composition of the Earth's atmosphere has been changed by human activity and some of these changes are harmful to human health, crops and ecosystems. Examples of problems which have been addressed by atmospheric chemistry include [[acid rain]], [[photochemical smog]] and [[global warming]]. Atmospheric chemistry seeks to understand the causes of these problems, and by obtaining a theoretical understanding of them, allow possible solutions to be tested and the effects of changes in government policy evaluated.<br />
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== Atmospheric Composition ==<br />
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<table><tr><th colspan=2>Average composition of dry atmosphere, by volume<br />
<tr><td>'''Gas'''<td>'''per [http://nssdc.gsfc.nasa.gov/planetary/factsheet/earthfact.html NASA]'''<br><br />
<tr><td>[[Nitrogen]]<td>78.084%<br />
<tr><td>[[Oxygen]]<td>20.946%<br />
<tr><td>[[Argon]]<td>0.934%<br />
<tr><td colspan=2>Minor constituents in [[Parts per million|ppmv]].<br />
<tr><td>[[Carbon Dioxide]]<td> 350<br />
<tr><td>[[Neon]]<td>18.18<br />
<tr><td>[[Helium]]<td>5.24<br />
<tr><td>[[Methane]]<td>1.7<br />
<tr><td>[[Krypton]]<td>1.14<br />
<tr><td>[[Hydrogen]]<td>0.55<br />
<tr><td>[[Water vapor]]<td colspan=2>Highly variable;<br>typically makes up about 1%<br />
</table><br />
Notes: the [[concentration]] of CO<sub>2</sub> and CH<sub>4</sub> vary by season and location. ppmv represents parts per million by volume.<br><br />
The mean molecular mass of air is 28.97 g/mole.</div>69.44.205.38