Increasingly　stringent　regulations　regarding　vehicle　emissions　have　contributed　to　the　diversification　of　vehicle　technologies,　resulting　in　the　increasing　complexity　of　typical　vehicles　that　make　up　a　fleet.　In　order　to　investigate　the　real　gas　emissions　of　different　typical　vehicles,　tests　were　conducted　using　a　portable　emission　measurement　system　(PEMS)　in　Beijing　and　emission　studies　were　conducted　on　eight　light-duty　passenger　vehicles　(LDPVs,　including　light-duty　gasoline　passenger　vehicles　and　hybrid　electric　vehicles),　eight　heavy-duty　passenger　vehicles　(HDPVs),　and　four　light-duty　trucks　(LDTs).　The　results　show　that　the　emissions　of　relevant　pollutants　from　LDPV　meet　the　emission　standard　limits.　The　emission　factors　of　CO2,　CO,　NOX,　and　HC　of　China　IV　and　China　V　hybrid　electric　vehicles　(HEVs)　are　much　smaller　than　the　emission　standard　limits　and　the　emission　factors　of　other　vehicles,　which　have　better　emission　reduction　effects.　Among　LDPV,　heavy-duty　passenger　vehicles　(HDPVs),　and　LDT,　the　emissions　of　HDPV　and　LDT　are　extremely　high.　Emission　characteristics　vary　on　different　types　of　roads,　with　the　highest　emission　factors　generally　occurring　on　secondary　roads.　The　micro-trip　method　was　used　to　explore　the　influence　of　speed　on　emission　factors.　HEV　are　less　sensitive　to　speed　changes　and　can　still　maintain　a　low　emission　level　at　low　speeds.　The　average　speed　and　emission　factors　of　HDPV　in　micro-trip　has　a　strong　correlation.　©　2023　by　the　authors.