a method for separating undesired particles from a gaseous medium in which the particles are dispersed . the particles and gaseous medium are passed through a fluid - pervious filtration media which has been infused with an absorbtion composition comprising a homogeneous thermal reaction product of an oil component selected from the group consisting of glycerides , fatty acids , alkenes , and alkynes , and a methacrylate or acrylate polymer component . the particles are thereby immobilized at the media . the purified gaseous medium having passed through the filtration media is collected and flowed to a utilization or discharge point .