Lecture 27 - Ozone and Photochemical Smog Lecture#27 Ozone...

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Ozone and Photochemical Smog ± Lecture#27 ± Ozone forming potential and control ± ICPs #25 and 26 ± Reading: Rubin Ch 8. Sections 8.1, 8.2, 8.4-8.7 (Pg. 321-326, 340-364); Handout on Photochemical Smog and Ozone Overarching Questions: Urban Air Pollution and Photochemical Smog ± Where does ground level ozone come from? ± Why does so much ozone accumulate? ± How do volatile fuels and solvents become transformed into ingredients such as PeroxyAcetyl Nitrate (PAN) and formaldehyde? ± What strategies can be used to control ozone formation? (ICPs#25, 26) ± How can the ozone formation potential of different hydrocarbons be evaluated? What is Photochemical Smog? In the simplest sense: VOCs + NOx + Sunlight Smog Smog itself is a mixture of phtotochemical oxidants (primarily O 3 and other HCs) that is responsible for respiratory illness, eye irritation, cracking of rubber products, and damage to vegetation. Typical Buildup of NO, NO 2 , O 3 in LA NO 2 O 3 morning daily cycle Formation of O 3 : The Key Reactions N 2 + O 2 2NO 2NO + O 2 2NO 2 NO 2 + Sunlight NO + O O + O 2 + M O 3 + M O 3 + NO NO 2 + O 2 combustion reaction NO: is primary pollutant Secondary pollutant
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NO 2 Photolytic Cycle: A Summary But if this was the whole story O 3 would not accumulate in troposphere; Need another source to remove NO!! produces O 3 destroys O 3 Why does O 3 accumulate? Why does Peroxyacetyl Nitrate form? Key Concepts and Reactions: Please read the notes provided… Why does O 3 accumulate? Why does Peroxyacetyl Nitrate form?
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This note was uploaded on 04/17/2008 for the course CEE 260 taught by Professor Kimf.hayes during the Fall '06 term at University of Michigan.

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Lecture 27 - Ozone and Photochemical Smog Lecture#27 Ozone...

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