The Magee Scientific Carbonaceous Aerosol Speciation System, model CASS, is a combined unit of a Total Carbon Analyzer, model TCA08 and an Aethalometer, model AE33 providing a revolutionary scientific OC/EC analyzer that measures the Total Carbon Content(“TC”), the Elemental Carbon content(EC), the Organic Carbon content(OC) and the Black Carbon content (BC) of suspended aerosol particles in near-real Time.