The concentration and size distribution of particles dispersed in the atmosphere are major parameters in the study, evaluation and control of the aero-environment. In addition, relating these parameters to existing meteorological conditions are of prime importance in studying and understanding the behavior of the particles. The primary objective of this study was to demonstrate that three particle sizing and counting instruments could be combined to form a system capable of automatically monitoring a broad spectrum particle size distribution. The meteorological-time data are essential in the determination of sedimentation, coagulation and diffusion phenomena. In addition, the accumulation of time dependent aerosol and meteorological parameter data should provide insight into the investigation of weather variations and exposure levels which may be significant in detecting and explaining physiological responses.