Disclosed is a PM clean-up system which can prevent an excessive accumulation of PM particles on a filter. The PM clean-up system comprises a porous filter base material (10) through which an exhaust gas is to be passed and a catalyst component (11) supported on the filter base material (10). The system can trap PM particles contained in an exhaust gas and remove the trapped PM particles by oxidation. In the system, an active oxygen-generating microparticle (12) is carried between the catalyst components (11) on the surface of the filter base material (10). The PM particles are partially oxidized by active oxygen generated with the active oxygen-generating microparticle (12) to cause a defect therein, whereby the PM particles become susceptible to oxidation. As a result, the oxidation of the PM particles is accelerated, thereby preventing or reducing the accumulation of the PM particles.