Any discussion of the relation between transportation and air quality planning on a metropolitan scale must necessarily begin with a brief explanation of the roles and responsibilities of key agencies and organizations. Accordingly, this paper starts with a summary description of those planning and implementing agencies in the National Capital Region that contribute to the integraton of air quality considerations into transportation planning. This is followed by a review of the area's experience with the annual assessment of consistency of the region's transportation plans and programs to state implementation plans to achieve air quality. Several of the key issues that have generated controversy between transportation planners and air quality planners are identified and discussed. And, finally, this paper reports on the current organizational and planning approach being developed for the metropolitan Washington area to meet the requirements of the Clean Air Act Amendments of 1977./Author/