NYPD, Researchers to Release Tracer Gas in Subways Again Friday

Thursday, July 18, 2013 - 01:53 PM

An air sampler on West 47th Street -- part of a scientific study to understand how the subway system affects airflow (Kate Hinds)

Day two of air flow testing in the NYC subway and around the city is happening Friday, the NYPD announced. 

As with the first day of testing earlier this month, researchers will release an inert gas into various parts of the New York City transit system then monitor where the special chemical air particles flow around the five boroughs. 

The goal is to simulate what would happen if a hazardous material were released in the city, such as in the case of a dirty bomb.

The NYPD said "the Subway-Surface Air Flow Exchange program previously announced will begin Friday at 8:00 a.m." The third of three days of air flow testing will take place later in the summer and is dependent on weather conditions. 

New Yorkers should not be alarmed if they notice the air monitors, black boxes like the one pictured above. The gas itself, perfluorocarbons, is invisible and has no scent. 

For more detail on the so-called tracer gas being released and its potential health effects, see this explainer we did a few weeks back in which we learned PFCs were originally created during the Manhattan project and have been used safely for decades in a variety of medical procedures. 

A bit more on the S-SAFE program is here


Comments [1]


I dont understand why people are not asking more questions about this !
For one - Why not close down a subway station at Night and test it then when there are no People around to be exposed to it. Safe or not - this is a Gas that we are not normally exposed to. What if some people have allergies to it ?
This is one of the Hottest days of the year with extreme heat advisories, is that deliberate ? to test how Gas flows in heat waves ? this is just ridiculous. we have enough to deal with on a day like today in keeping cool and hydrated. We as Highly taxed citizens should have a right to say no to this or at least ask questions prior to it happening.

Jul. 19 2013 10:22 AM

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