DHS document New York
Particle and gas tracer test releases would occur within the two-week timeframe October 17 – October 30, 2021. There would be five separate testing days scheduled within this timeframe.
The Proposed Action would include the release of low concentrations of safe particulate & gas tracer materials as
part of two projects sponsored by the DHS Science & Technology Directorate and entitled “Urban Threat Dispersion (UTD)” the “Chemical & Bio-defense Testbed (CBT)”.
Test locations include the following outdoor locations: Times Square, World Trade Center Complex, Union Square Park. Indoor
release locations include platforms at Times Square and Union Square subway stations, as well as the Oculus transit hub.
The purpose of the tests is to collect quantitative data & info on the transport & deposition of particles that simulate release of a biological agent in major metropolitan area (UTD) to evaluate sensor architectures rapid detection & mitigation of a chemical-biological event...