A　large　amount　of　toxic　and　harmful　gases　would　be　released　from　Municipal　Wastewater　Treatment　Plants　(WWTPs)　during　wastewater　treatment,　which　causes　occupational　diseases　frequently　occurring　among　workers　who　work　on　sewage　treatment　for　a　long　time　in　China.　Detailed　wastewater　discharge　standards　are　stated　in　the　current　＂Standards　for　Pollutant　Discharge　from　Municipal　Sewage　Treatment　Plants＂,　while　the　available　types　and　discharge　standards　for　gaseous　pollutants　are　not　elaborated　clearly.In　this　paper　the　characteristics　of　gaseous　pollutants　emitted　from　different　wastewater　treatment　processes　and　units　in　WWTPs　were　summarized,the　release　pathways,　release　amount　and　influencing　factors　were　also　described.　Furthermore,　the　prevalent　treatment　pattern　for　gaseous　pollutants　was　that　the　exhaust　gas　was　collected　at　the　end　of　wastewater　treatment　first,　and　then　it　was　treated　comprehensively.　In　future　study,　the　correlated　relationships　between　the　parameters　of　wastewater　treatment　process　and　the　characteristics　of　gaseous　pollutants　should　be　studied　further.　©　2019,　Science　Press.　All　right　reserved.