Industry on Parade Compilation #30. Educational film concerning measures taken in various industries to maintain air quality inside manufacturing plants and emissions. Exterior shot of steel mill. Internal scene of man standing at/ adjusting large valves. Shot of "artificial lake" into which dust from steel mill exhausts is captured; two men showing water quality before and after treatment; man examining treated sludge at large machine. Scene of red hot steel on conveyor; chunks of processed sludge dropping on conveyor. Exterior shot of industrial area; sign "John Zink." Shot of two men attaching a smaller pipe to a larger petroleum pipe; shot of completed pipe burning off gases from petroleum refining operation.