A two-month (Jan. 16 - March 15, 1956) study was undertaken to learn the probative value of a single field sampling station in determining whether air pollution experienced by a residential area in one city, St. Bernard, Ohio, was primarily attributable to a suspected group of industrial sources in that city, or to sources within the adjacent village of Elmwood Place and the surrounding city of Cincinnati. Results from the sampling station indicated that the combination of an excess of sulphates, nitrates and aliphatic hydrocarbons in St. Bernard air over concentrations elsewhere in Greater Cincinnati, an excess of SO2 and dirt shade associated with northerly winds, and visual observation of the travel of plumes from suspected sources confirm the suspicion that the alleged group of industrial sources are the cause of complaints of odorous air pollution in certain residential areas of St. Bernard. This study shows that it is possible to draw this limited type of conclusion from a short term study using a single air sampling station.