This was the consensus of all the speakers at a seminar on "Design Considerations to Limit Dispersion of Immediately Harmful Contaminants in Large Buildings and Enclosed Vehicular Facilities," presented during the Annual Meeting of the American Society of Heating, Refrigerating, and Air-Conditioning Engineers (ASHRAE).
"You can't fight the laws of nature and physics," said Greg Sanchez, P.E., of New York City Transit, New York.