Bioaerosols play a significant role in indoor air pollution as they can be pathogenic or cause an allergic reaction following inhalation. In this study, indoor bioaerosol measurements are presented from a typical apartment in Athens and other indoor establishments in Chania, Greece. Concentrations of airborne bacteria and fungi were measured as colony forming units per cubic meter of air (CFU/m(3)) collected by impaction onto agar plates. Samples were taken by using a Merck MAS-100 bioaerosol collector. The bioaerosol data are presented together with indoor and outdoor PM10 and PM2.5 particle measurements. (c) 2005 Elsevier Ltd. All rights reserved.