PURPOSE: To simply and efficiently control and remove the contamiation with chlorodibenzodioxine in exhaust gas by using an adsorbing filter easy to handle consisting of an adsorbent efficiently adsorbing chlorodibenzodioxine and a lightweight material.

CONSTITUTION: Activted grass peat 2 is held between two heat-resistant cloths 1 and quilting like stitches 3 are applied to the glass cloths to obtain a chlorodibenzodioxine adsorbing filter A. This filter is arranged to the exhaust gas passage on the downstream side of a combustion/heating furnace of a chlorine-containing material.