Lesson14AirpollutionAirpollutionisthehumanintroductionintotheatmosphereofchemicals,particulatematter,anisms,,butthegreatestsourceofemissionsismobilesources,,whichcontributetoglobalwarming,haverecentlygainedrecognitionaspollutantsbyclimatescientists,,',,theymaybenaturalorman-,primarypollutantsaredirectlyemittedfromaprocess,suchasashfromavolcaniceruption,,—:thatis,:Sulfuroxides(SOx)especiallysulfurdioxide,,,usuallyinthepresenceofacatalystsuchasNO2,formsH2SO4,(NOx)-browntoxicgashasacharacteristicsharp,
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