The paper describes the development of the 1985 National Acid Precipitation Assessment Program (NAPAP) emissions inventory. NAPAP includes the facility for research and preparation of comprehensive emission inventories. Task Group B, Man-made Sources within NAPAP, has directed the development of a 1980 inventory for anthropogenic emissions in the contiguous U.S. to support Lagrangian and Eulerian acid rain transport and deposition model development. The development of such inventories includes the formulation of emission factors for many pollutants (e.g., SO2, NOx, primary sulfate, alkaline dusts, CO, and numerous specific and/or generic volatile organic compounds). Activities to date have included the development of a historic emission inventory for SO2 and NOx within the 1900-1980 period. Present and near-term projects include a number of interrelated tasks to develop a 1985 emission inventory. A data handling system will be developed to provide the necessary spatial, temporal, and species resolution of the inventory. Planned quality assurance activities will focus on establishing a QA expert team for review of the inventory development. The 1985 inventory will be formulated to support the final testing and application of the Eulerian model.