Abstract
The paper details the experience with the satisfactory dispersion of hot gases from two power plants each larger than 1000 MW designed in 1952-1953. The effects of this experience on the design of 825-foot stacks for the Cardinal Plant is covered, with a description of test work underway to verify the results. This includes dustfall and sulfur dioxide sampling at fixed locations. A case is made for the use of high stacks to control ground level concentrations, rather than resorting to fuel restrictions or emission standards which are unnecessary and economically unsound.

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