A system for the abatement of the pollutants produced by an internal combustion engine (E) having an intake pipe (IP) and an exhaust pipe (EP), the system comprising a device (ATS) for the abatement of the pollutants contained in the exhaust gases produced by the internal combustion engine, wherein said ATS device comprises - at least a first exhaust gas treatment portion (ATS1) comprising a Diesel particulate filter (DPF, cDPF, SCRoF), - a bypass duct (BP) adapted to bypass said first treatment portion and arranged for connecting a first point, upstream of the first treatment portion (ATS1), to a second point, downstream of the first treatment portion, - a recirculation pipe (EGRP) which connects a third point, arranged between said first treatment portion (ATS1) and said second point, to the intake pipe (IP) of the internal combustion engine; wherein said ATS device further comprises - a first valve (FP) arranged to be adapted for selectively causing • a first operating condition, in which there is a transit of exhaust gas, that passes through said first treatment portion (ATS1) towards said second point, and, accordingly, at least a partial occlusion of said bypass duct • a second operating condition, in which there is a transit of exhaust gas, that passes through said first treatment portion (ATS1) towards said recirculation pipe, and a consequent opening of said bypass duct, the system being characterised in that said first valve is further arranged to be adapted for preventing the transit of exhaust gas that passes through said first treatment portion (ATS1) towards said second point. - at least a first exhaust gas treatment portion (ATS1) comprising a Diesel particulate filter (DPF, cDPF, SCRoF), - a bypass duct (BP) adapted to bypass said first treatment portion and arranged for connecting a first point, upstream of the first treatment portion (ATS1), to a second point, downstream of the first treatment portion, - a recirculation pipe (EGRP) which connects a third point, arranged between said first treatment portion (ATS1) and said second point, to the intake pipe (IP) of the internal combustion engine; wherein said ATS device further comprises - a first valve (FP) arranged to be adapted for selectively causing • a first operating condition, in which there is a transit of exhaust gas, that passes through said first treatment portion (ATS1) towards said second point, and, accordingly, at least a partial occlusion of said bypass duct • a second operating condition, in which there is a transit of exhaust gas, that passes through said first treatment portion (ATS1) towards said recirculation pipe, and a consequent opening of said bypass duct, the system being characterised in that said first valve is further arranged to be adapted for preventing the transit of exhaust gas that passes through said first treatment portion (ATS1) towards said second point. • a first operating condition, in which there is a transit of exhaust gas, that passes through said first treatment portion (ATS1) towards said second point, and, accordingly, at least a partial occlusion of said bypass duct • a second operating condition, in which there is a transit of exhaust gas, that passes through said first treatment portion (ATS1) towards said recirculation pipe, and a consequent opening of said bypass duct, <EOS>