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Smoke rings from model experiments in the laboratory may foreshadow a large-scale process to reduce air pollution. Timothy Fohl, Ph.D. '63 suggests that smoke blown from factory chimney stacks into the atmosphere in rings will ascend to mugh higher altitudes than the conventional plumes of smoke. The higher in the atmosphere the smoke finally disperses, the less likelihood it has of adding to the air pollution at the surface. The Technology Review Oct/Nov 1967