Nonthermal　plasma　(NTP)　is　a　promising　technology　for　the　decomposition　of　chlorobenzene　(CB),　but　many　conditions　will　affect　the　performance　of　NTP.　The　effects　of　gas　temperature,　relative　humidity,　oxygen　content,　sulfur　dioxide　(SO2),　and　nitric　oxide　(NO)　on　the　removal　of　CB　in　dielectric　barrier　discharge　(DBD)　were　studied　in　this　study.　The　results　showed　that　the　gas　temperature　with　the　highest　CB　removal　rate　was　50°C　at　14　kV　and　200°C　at　18　kV.　With　the　addition　of　water　vapor,　the　removal　efficiency　of　CB　first　increased　and　then　decreased,　reaching　the　highest　(52.94%)　when　the　relative　humidity　was　20%　at　14　kV.　The　presence　of　oxygen　inhibited　the　degradation　of　CB.　At　14　kV,　when　the　oxygen　concentration　increased　from　0%　to　25%,　the　degradation　efficiency　of　CB　decreased　from　71.93%　to　32.54%.　In　the　discharge　process,　the　addition　of　SO2　promoted　the　removal　of　CB,　while　NO　inhibited　under　the　same　conditions.　The　addition　of　SO2　and　NO　did　not　change　the　specific　energy　density.　For　ozone　(O3),　the　addition　of　water　molecules,　SO2,　and　NO　inhibited　the　formation　of　O3.　It　is　of　great　significance　to　study　the　influence　of　relevant　gas　conditions　on　the　degradation　of　CB　by　NTP　technology,　so　as　to　provide　a　reference　for　industrial　application.　©　2023　American　Society　of　Civil　Engineers.