A Seminar/Workshop was convened by the Regional Field Studies Office of the Environmental Protection Agency's Environmental Sciences Research Laboratory to provide for the exchange of research results and to discuss the state-of-the-art of instrumentation and investigative techniques applicable to studies of regional scale persistent elevated pollution episodes (PEPE's). This report comprises the results of four workshops conducted after 2 1/2 days of formal presentations of scientific papers. The workshops, held concurrently, were charged with the responsibility of providing definitive recommendations on the conduct of future field studies of PEPE's. The subjects covered by the workshops were: experiment design, measurement strategy and tactics and communication requirements; meteorology, transport and validation; and instrumentation. The instrumentation workshop was divided into two sessions: instrumentation for the study of transformation of pollutants and instrumentation for remote sensing of pollutants. Separate reports are included for each of these sessions.