Subway-Surface Air Flow Exchange program tests underway for 2nd time

The NYPD and a team of scientists conducted the second of three subway air flow tests. Researchers dispersed a non-toxic, odorless and invisible gas inside

Researchers are dispersing a harmless gas to see how far it spreads in the subway system.

Researchers are dispersing a harmless gas to see how far it spreads in the subway system. (7/19/13)

NEW YORK - The NYPD and a team of scientists conductied the second of three subway air flow tests.

Researchers dispersed a non-toxic, odorless and invisible gas inside Manhattan stations as part of the Subway-Surface Air Flow Exchange program. Samples will be collected in all of the five boroughs to see how far the gas spreads.

The police department will use the results to improve its emergency response in the case of an attack or accidental release of hazardous materials.

The first test was conducted last Tuesday. The date of the third and final test has not yet been released.
 

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