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Ground level ozone is classified as a secondary pollutant because it is

  • A.Produced by soil bacteria
  • B.Formed photochemically from precursors
  • C.Emitted directly by vehicles
  • D.Released by power station stacks

Answer: B

Sunlight drives the reaction between the two precursor families, which is why urban ozone peaks in the afternoon and downwind of the city rather than in it. Controlling it means controlling its precursors rather than ozone itself.

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