Bioaerosols　have　widely　been　a　concern　due　to　their　potential　harm　to　human　health　caused　by　the　carrying　and　spreading　of　harmful　microorganisms.　Biofiltration　has　been　generally　used　as　a　green　and　effective　technology　for　processing　VOCs.　However,　bioaerosols　can　be　emitted　into　the　atmosphere　as　secondary　pollutants　from　the　biofiltration　process.　This　review　presents　an　overview　of　bioaerosol　emissions　from　gas　bioreactors.　The　mechanism　of　bioaerosols　production　and　the　effect　of　biofiltration　on　bioaerosol　emissions　were　analyzed.　The　results　showed　that　the　bioaerosol　emission　concentrations　were　generally　exceeded　10(4)　CFU　m(-3),　which　would　damage　to　human　health.　Biomass,　inlet　gas　velocity,　moisture　content,　temperature,　and　some　other　factors　have　significant　influences　on　bioaerosol　emissions.　Moreover,　as　a　result　of　the　analysis　done　herein,　different　inactivation　technologies　and　microbial　immobilization　of　bioaerosols　were　proposed　and　evaluated　as　a　potential　solution　for　reducing　bioaerosols　emissions.　The　purpose　of　this　paper　is　to　make　more　people　realize　the　importance　of　controlling　the　emissions　of　bioaerosols　in　the　biofiltration　process　and　to　make　the　treatment　of　VOCs　by　biotechnology　more　environmentally　friendly.　Additionally,　the　present　work　intends　to　increase　people＇s　awareness　in　regards　to　the　control　of　bioaerosols,　including　microbial　fragment　present　in　bioaerosols.　(C)　2020　Published　by　Elsevier　Ltd.