Previous works have evaluated cigarette filter carbon particle release from various filter designs. The recently introduced CelFX™ Matrix Technology offers high loadings of carbon, with low pressure drops and has not been studied for the particle release effect. This study will compare a filter with a CelFX™ segment against cigarette filter designs containing either a carbon-on-tow segment or a cavity segment. In all cases, a cellulose acetate segment is used as the mouth end. This study focuses on particle release from 0.125 micron to 5 micron. This particle range encompasses the respirable particles as listed by Organization for Economic Cooperation and Development (OCED) guidelines. Initial data shows CelFX™ carbon filters have significantly less particle release than a cavity filter for 0.125-5 micron size particle range. Commercial carbon-on-tow filters will also be evaluated.