This enforcement guide was published in anticipation of the problems which state local and Federal air pollution control officials may encounter in reviewing and understanding several primary metallurgical operations as they affect emissions to the atmosphere. It focuses on the primary metallurgical industry and includes a process description, a discussion of emission sources, typical control devices, stack gas and process monitoring instrumentation, and Inspectors Worksheets for operations in the iron and steel, aluminum, copper, lead, and zinc industries. All major operations in each of those industries were analyzed including an enforcement procedure for the storage and handling of raw materials. Upset conditions and abnormal operating circumstances were examined in relation to their role in air pollution. (Modified author abstract)