霧霾的危害英語作文：Air Pollutant
Thiskindofairpollutantcomefromavarietyofnaturalandmanmadesources.Naturalsourcescanincludewindblowndust,andsootfromwildfires.Manmadesourcescanincludemotorvehicles,andindustrialfuelburning,andmanufactur...
Thiskindofairpollutantcomefromavarietyofnaturalandmanmadesources.Naturalsourcescanincludewindblowndust,andsootfromwildfires.Manmadesourcescanincludemotorvehicles,andindustrialfuelburning,andmanufactur...