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| | | #REDIRECT [[Photochemical smog]] |
| #REDIRECT [[photochemical smog]] | |
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| == photochemical smog ==
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| <div class="definition"><div class="short_definition">Air contaminated with [[ozone]], [[nitrogen oxides]], and [[hydrocarbons]], with or without natural [[fog]] being present.</div><br/> <div class="paragraph">In the presence of [[sunlight]], [[hydrocarbons]] and [[NO<sub>x</sub>]] are involved in a complex series of chemical reactions that eventually creates ozone and other [[oxidants]] as [[secondary pollutants]]. However, ozone is also destroyed by NO<sub>x</sub>. Photochemical [[air pollution]] levels are generally proportional to concentrations of nitrogen oxides and hydrocarbons; they also increase with strong solar [[intensity]] and high ambient temperatures, which increase biogenic volatile organic emissions to the [[atmosphere]] from vegetation. The pollutant levels are inversely proportional to [[wind speed]] and [[inversion]] height. <br/>''See also'' [[smog]].</div><br/> </div>
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