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1.IntroductionMethane(CH#)isanimportantgreenhousegasinatmosphere.ThemainremovalprocessofCH4inatmosphereisreactedwithOHwhichisdeterminedbytheabundanceofmethane,carbonmonoxide(CO)andnitrousoxides(NO.)whoseemissionshaveincreasedgreatlybecauseofhumanacti...