Method for the preparation of a catalysed particulate filter comprising the steps of a) providing a particulate filter body with longitudinal flow passages being confined by longitudinal porous walls, defining a dispersion side and a permeation side; b) providing a first catalyst washcoat containing a first catalyst composition being active in selective catalytic reduction of nitrogen oxides, the first catalyst composition comprising at least one of a zeolite, a silica aluminum phosphate, an ion exchanged zeolite, a silica aluminum phosphate promoted with iron and/or copper, one or more base metal oxides and a catalyst support of at least one of cerium tungsten oxide on a titania support, an alumina support, a zirconia support, a silica support or mixtures thereof; c) providing a second catalyst washcoat containing a second combined catalyst composition in form of a mixture of a catalyst being active in selective oxidation of ammonia to nitrogen, and a catalyst being active in oxidation of carbon monoxide and hydrocarbons,the second combined catalyst composition comprising a mixture of platinum and palladium supported on at least one of alumina, titania, ceria, zirconia and silica mixed with copper and/or iron containing zeolite or silica alumina phosphate with chabazite structure; d) coating the particulate filter body with the first catalyst washcoat on the entire dispersion side and within partition walls of the filter body, and coating the particulate filter with the second combined catalyst washcoat on the entire permeate side of the filter body; and e) drying and heat treating the coated filter to obtain the catalysed particulate filter, wherein mode particle size of the first catalyst in the first washcoat is smaller than the mean pore diameter of the longitudinal walls, and wherein mode particle size of the second combined washcoat is larger than the mean pore diameter of the longitudinal walls. a) providing a particulate filter body with longitudinal flow passages being confined by longitudinal porous walls, defining a dispersion side and a permeation side; b) providing a first catalyst washcoat containing a first catalyst composition being active in selective catalytic reduction of nitrogen oxides, the first catalyst composition comprising at least one of a zeolite, a silica aluminum phosphate, an ion exchanged zeolite, a silica aluminum phosphate promoted with iron and/or copper, one or more base metal oxides and a catalyst support of at least one of cerium tungsten oxide on a titania support, an alumina support, a zirconia support, a silica support or mixtures thereof; c) providing a second catalyst washcoat containing a second combined catalyst composition in form of a mixture of a catalyst being active in selective oxidation of ammonia to nitrogen, and a catalyst being active in oxidation of carbon monoxide and hydrocarbons,the second combined catalyst composition comprising a mixture of platinum and palladium supported on at least one of alumina, titania, ceria, zirconia and silica mixed with copper and/or iron containing zeolite or silica alumina phosphate with chabazite structure; d) coating the particulate filter body with the first catalyst washcoat on the entire dispersion side and within partition walls of the filter body, and coating the particulate filter with the second combined catalyst washcoat on the entire permeate side of the filter body; and e) drying and heat treating the coated filter to obtain the catalysed particulate filter, wherein mode particle size of the first catalyst in the first washcoat is smaller than the mean pore diameter of the longitudinal walls, and wherein mode particle size of the second combined washcoat is larger than the mean pore diameter of the longitudinal walls.