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 NEW YORK (AP) - Government scientists released colorless, harmless gas at four Manhattan locations Monday as part of an effort to find out how fast and far a toxic substance could spread if released in the city.
"It went very well," said Susan Bauer, a spokeswoman for the Urban Dispersion Program, which aims to produce a computerized model of air flow patterns that could help authorities decide how to evacuate people after a chemical or biological attack.
The project started five years ago with pilot programs in Salt Lake City and Oklahoma City.
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