I did a search and this didn't come up, so I'm posting. Move if needed mods, thanks.
http://www.newsday.com/news/health/ny-hsgas0805,0,4772443.storysnip>
BY BRYN NELSON
STAFF WRITER
August 5, 2005
Amid heightened anti-terrorism vigilance in New York City's subways, a mammoth Department of Homeland Security-sponsored project starting as early as Saturday will seek to answer how harmful gases might disperse through midtown's streets and the warren of subway tunnels beneath them.
The simulation, which will use colorless, odorless and harmless "tracer" gases, follows a smaller effort in March that focused on the Madison Square Garden area. This time, a team of more than 150 researchers and volunteers working on the Urban Dispersion Program's second field study will fan out over a much larger section of midtown, ranging from 37th to 59th streets and from 10th to Third avenues, and including stations along the Broadway subway line and other lines in the area.
Scientists will release the gases at four of eight possible locations above ground, depending on the wind, within an office building and on a subway platform of the Broadway line at 50th Street and Seventh Avenue.
Six separate experiments are planned over the next three weeks, with specific dates dependent on the weather, and the subway portion planned for the final three release dates.
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What timing.