Lec9_Groundlevel_air_poll-3_POST

Lec9_Groundlevel_air_poll-3_POST - 1 2 NO NO2 process 3 4...

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Baird and Cann (2005) Fig 2-4 O 3 NO• VOCs NO 2 aldehydes NO Ground-Level Air Pollution-3: Mechanism of Smog Formation CHEM/ENVS 380 Mar 9, 2010 Van Loon and Duffy, Environmental Chemistry, Oxford, 2000. 1. How is ozone produced at ground  level?  (what is the source of O?) 2. What primary pollutants are  involved in the photochemical smog  process? 3. What are the products of the  photochemical smog process? 4. What catalysts are involved and  how?
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NO 2 is Source of O at Ground Level Spiro and Stigliani (2003), Chemistry of the Environment, Prentice Hall photodecomposition
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One Shot of NO 2 Can’t Sustain a Smog. Why? NO 2 + UV-A NO + O O + O 2 O 3
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What Oxidizes NO Back to NO 2 ? 1) 2 NO• + O 2 2 NO 2 Oxidation by molecular oxygen This reaction proceeds very slowly . Can not account for all of the NO 2 2) NO• + ROO• NO 2 • + RO• Oxidation by peroxy (or organoperoxy) radical This reaction is fast 3) NO• + HOO• NO 2 • + OH• 1) Oxidation by hydroperoxy radical 2) This reaction is also fast
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