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Discussion

Methane is important as an air pollutant chiefly because it

  • A.Depletes stratospheric ozone directly
  • B.Is a greenhouse gas and ozone precursor
  • C.Is acutely toxic
  • D.Forms sulphuric acid

Answer: B

Its global warming potential over twenty years is many times that of carbon dioxide, and it also contributes to background tropospheric ozone. Its relatively short lifetime makes controlling it unusually effective in the near term.

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