Lec9_Groundlevel_air_poll-3_POST

Lec9_Groundlevel_air_poll-3_POST - Baird and Cann (2005)...

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Unformatted text preview: Baird and Cann (2005) Fig 2-4 O 3 NO VOCs NO 2 aldehydes Baird and Cann (2005) Fig 2-4 O 3 NO VOCs NO 2 aldehydes 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? NO 2 is Source of O at Ground Level Spiro and Stigliani (2003), Chemistry of the Environment, Prentice Hall photodecomposition One Shot of NO 2 Cant Sustain a Smog. Why? NO 2 + UV-A NO + O O + O 2 O 3 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...
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Lec9_Groundlevel_air_poll-3_POST - Baird and Cann (2005)...

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