The New York City Police Department announced Wednesday that it will deploy, then track, what it calls “harmless” gases into the city’s subway system over three non-consecutive days this summer.

The plan, to be enacted in July, will investigate New York’s readiness to handle a chemical terrorist attack by dispersing the colorless gas and tracing it as it flows through the city, according to Scientific American. The test is expected to cost $3.4 million and is scheduled to be carried out in all five boroughs and dozens of stations on 21 of the city’s 34 subway lines.

The police will use roughly 200 detectors to monitor the gas. Dubbed the Subway-Surface Air Flow Exchange, the test will be the largest of its kind and organized in cooperation with the energy department’s Brookhaven National Laboratory. They’ll use perfluorocarbon tracer gases (PFTs), which are frequently used to measure potential sites for underground construction.

Oh So do you mean something like this “harmless” test from 60 years ago.. Or maybe this “harmless” experiment. Also dont be surprised if one of theses “drills” goes live

Original Article Here