Asked by tia

what are the sources of the following:
carbon dioxide CO2
chlorofluorocarbons CFC's
ground level ozone
Answered by Ms. Sue
http://en.wikipedia.org/wiki/Carbon_dioxide_in_Earth%27s_atmosphere#Sources_of_carbon_dioxide

http://www.pollutionissues.com/Br-Co/CFCs-Chlorofluorocarbons.html#b

http://www.airqualityontario.com/science/pollutants/ozone.php
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