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Ground level ozone = smog?

  1. Mar 27, 2004 #1
    Hi, I have to do a report on ground level ozone and was just wondering if that is just another word for smog. Also, I need help in answering the following questions:

    b) What are mechanisms of the reactions that lead to the production of ground level ozone?

    c) What is the connection between the production of ozone and kinectics?

    Any help is greatly appreciated. If any information that you write here is taken from another website, could you please leave the link as well so I could investigate further. Thanks.
     
  2. jcsd
  3. Mar 29, 2004 #2
    Smog is a colloid, or more specifically, a solid and liquid dispersed in a gas.

    Ground level ozone is a pollutant that oxidizes compounds which then mixes with air, water vapor, and dust to form photochemical smog. This ozone is produced from unburned hydrocarbons from things such as internal combustion engines and occurs in several steps.

    1. Sometimes nitrogen combines with oxygen in the engine's cylinders, producing the free radical NO: N2 + O2 --> 2NO

    2. When these free radicals reach the air, it again reacts with oxygen to produce NO2 radicals that react with water vapor to form HNO3:
    a. 2NO + O2 -->2NO2
    b. 3NO2 + H2O --> NO + 2HNO3

    3. Sunlight reacts with the NO formed in the second reaction that splits it up into nitrogen and oxygen: NO2 --sunlight--> NO + O

    4. The free oxygen reacts with O2 atoms to form ozone: O + O2 --> O3

    I got this from the Modern Chemistry book by Holt, Rinehart, and Winston.
    Im not quite sure about the kinetics, but maybe it is related to temperature (the higher the temperature the faster the rate due to more energetic particles).

    This link shows the environmental effects of ground-level ozone:
    http://www.epa.gov/ttn/oarpg/naaqsfin/o3health.html
     
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