Stack design problems fall into two general caterories--(1) those of building re-entry, and (2) those of general area pollution. Extensive research has developed adequate information, available in the literature, to permit effective stack design. A major roadblock to effective design has been the strong belief by architects and engineers that high stacks--or any stacks for that matter--are ugly attachments that detract greatly from building appearance This need not be the case. It is the purpose of this paper to demonstrate that better solutions are possible. Contents include--(1) stack design and prevailing winds, (2) air flow around buildings, (3) air and water pollution control, and (4) recommendations for effective stack design. A bibliography of references on air pollution and stack design is also included. (RH)