The Respro Cinqro Mask will need its filters changing after a certain amount of time. The Cinqro Urban Chemical/Particle filter is a combination filter and is the same specification as the Techno filter with a more user friendly construction. The Activated Charcoal Cloth (DACC) layer in this filter has excellent adsorption properties when it comes to SO2, NO2, VOC's and LLO uptakes (resulting from vehicle exhaust pollutants). This DACC layer together with the Hepa-type particle filter layer in one single filter provides submicron (considerably smaller than PM2.5) dust capability together with gas and vapour capability all in one unit.