A summary is presented of the research results of a three year study of the economic effects of changes in air quality in the Willamette Valley. The study specified a conceptual model within which the benefits of controlling air pollution can be evaluated, as well as generated new testable hypotheses concerning the effects of air pollution on consumer activity. Implementation of the benefit-cost methodology consistent with the conceptual model and its associated hypotheses focused on the estimation of the various benefits and costs of controlling smoke produced by open burning of grass seed fields in the Willamette Valley. Eight appendices are attached which present theoretical and empirical materials, new, generally unappreciated theoretical results and empirical investigations which tested important hypotheses. (Author Modified Abstract)