"Lec 31 - The Two Ozone Problems" The Atmosphere, the Ocean and Environmental Change (GG 140) There are two ozone problems in the atmosphere. Tropospheric ozone in the form of photochemical smog is sometimes dangerously high whereas stratospheric ozone concentration is sometimes dangerously low. Photochemical smog is created through chemical reactions between UV radiation from the run and nitrogen oxides that are emitted from automobiles. High concentrations of tropospheric ozone are dangerous because of the damage ozone can cause to a person's airway if it is inhaled. The EPA has specified limits of ozone concentration but several counties in the USA exceed these limits. The primary air pollutants from which ozone is created have a peak concentration twice a day typically, which is associated with rush hour times during the day. 00:00 - Chapter 1. Air Pollutants 06:05 - Chapter 2. Two Ozone Problems 07:08 - Chapter 3. Ozone Properties 11:20 - Chapter 4. Photochemical Smog 15:16 - Chapter 5. Ozone Concentration Limits 25:10 - Chapter 6. Creation of Ozone Pollution 26:41 - Chapter 7. Primary Pollutants Complete course materials are available at the Open Yale Courses website: http://oyc.yale.edu This course was recorded in Fall 2011.
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