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A large Urban Dispersion Program study is scheduled to be conducted in and around mid-town Manhattan this coming August. This study is funded by the U. S. Department of Homeland Security . As part of this study, non-toxic perfluorocarbon tracer gases will be released in mid-town Manhattan, and the dispersion of the tracer gases will be monitored using a network of sensors deployed in Manhattan. Scientists will be deploying a radar wind profiler and launching weather balloons on the Stevens campus to provide measurements of the conditions upwind of the study area.