Method for treatment of an exhaust stream in an exhaust treatment system of a vehicle, which results from a combustion in a combustion engine of the vehicle, comprising: - determining a soot threshold value S th based on at least one or more operating conditions for said combustion engine, which operating conditions affect a level of flow for said exhaust stream, wherein said one or more operating conditions comprise one or more measured, modelled and/or predicted operating conditions; - a first oxidation of compounds comprising one or more of nitrogen, carbon and hydrogen in said exhaust stream with the use of a first oxidation catalyst; - a control of a first supply of a first additive into said exhaust stream with the use of a first dosage device, arranged downstream of said first oxidation catalyst, wherein said control of said first supply is carried, out with the objective of preventing an accumulation of soot exceeding said soot threshold value S th in a catalytic filter, arranged downstream of said first dosage device; - a first reduction of nitrogen oxides NO x in said exhaust stream with the use of reduction characteristics in an at least partly catalytic coating comprised in said catalytic filter, and with the use of said first additive; - a catching and oxidising of soot particles in said exhaust stream with the use of said catalytic filter; and - a control of a second supply of a second additive into said exhaust stream with the use of a second dosage device, arranged downstream of said catalytic filter; - a second reduction of nitrogen oxides NO x in said exhaust stream, with the use of at least one of said first and said second additive in a reduction catalyst device, arranged downstream of said second dosage device; wherein said control of said first supply of said first additive based on said soot threshold value S th results in nitrogen dioxide NO 2, for facilitating oxidation of soot particles in said catalytic filter, being available in said catalytic filter. - determining a soot threshold value S th based on at least one or more operating conditions for said combustion engine, which operating conditions affect a level of flow for said exhaust stream, wherein said one or more operating conditions comprise one or more measured, modelled and/or predicted operating conditions; - a first oxidation of compounds comprising one or more of nitrogen, carbon and hydrogen in said exhaust stream with the use of a first oxidation catalyst; - a control of a first supply of a first additive into said exhaust stream with the use of a first dosage device, arranged downstream of said first oxidation catalyst, wherein said control of said first supply is carried, out with the objective of preventing an accumulation of soot exceeding said soot threshold value S th in a catalytic filter, arranged downstream of said first dosage device; - a first reduction of nitrogen oxides NO x in said exhaust stream with the use of reduction characteristics in an at least partly catalytic coating comprised in said catalytic filter, and with the use of said first additive; - a catching and oxidising of soot particles in said exhaust stream with the use of said catalytic filter; and - a control of a second supply of a second additive into said exhaust stream with the use of a second dosage device, arranged downstream of said catalytic filter; - a second reduction of nitrogen oxides NO x in said exhaust stream, with the use of at least one of said first and said second additive in a reduction catalyst device, arranged downstream of said second dosage device;