Which of these chemicals are usually parts of urban air pollution?

0 votes
     none of the above
      hydrocarbons
      particulates
      carbon monoxide
      photochemical smog
      all of the above
asked Jul 2, 2012 in Geography by anonymous
    

1 Answer

0 votes
all of the above
answered Jul 5, 2012 by Geodude ~Top Expert~ (9,680 points)



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