During Fiscal Year 1975, the Meteorology Laboratory, Air Resources Laboratories, National Oceanic and Atmospheric Administration, provided research and operational support to the Environmental Protection Agency. Operational support provided to the Office of Air and Waste Management, the Environmental Protection Agency Regional Offices, and other Environmental Protection Agency components included the review of the meteorological aspects of environmental impact statements, requests for variances, implementation plans, and grant and contract proposals; the application of dispersion models; and the preparation of dispersion studies and evaluations. Research support was in the areas of model development and application, climatic analysis, and atmospheric effects of pollutants. Dispersion models for inert and reactive pollutants were under development and evaluation, as were regional and boundary layer meteorological models and models of the pollutant removal processes. The fluid modeling facility began experiments in the wind tunnel, and construction of the water channel/towing tank neared completion. The Regional Air Pollution Study observing network of surface and upper air stations in the St. Louis, MO, metropolitan area went into full operation.