Gas emission of polychlorinated dibenzo-p-dioxins and polychlorinated dibenzofurans (PCDD/Fs) from 19 commercial municipal solid waste (MSW) incinerators in China are investigated. The emission concentrations of PCDD/Fs were 0.042–2.461ng TEQNm −3 with an average value of 0.423ng TEQNm −3 . The emissions of PCDD/Fs from 16 MSW incinerators were below the MEP regulation level (1.0ng I-TEQNm −3 ), while only six systems have the dioxin emission levels below the limit established by the European Union Directive of 0.1ng I-TEQNm −3 . The emission factors of PCDD/Fs from 19 MSW incinerators were calculated to be 0.169–10.72μg TEQton −1 MSW with an average value of 1.728μg I-TEQton −1 MSW. The total amount of PCDD/Fs emitted from MSW incinerators to the atmosphere in China was estimated to 19.64g TEQ year −1 in 2006.