NYPD S-SAFE preparadeness program begins second round of testing

The second of three total Subway-Surface Air Flow Exchange studies, which intends to prepare the New York Police Department for a chemical, biological or radiological incident, began on Friday.

The study was jointly conducted by the NYPD and Brookhaven National Laboratory to find the best course of action to take during a potential chemical, biological or radiological incident. Officials will be creating evacuation and sheltering plans based on the research from the studies, according to CBS New York.

Testing was conducted at five boroughs beginning at 8am and used 200 sampling devices. Testing will continue until 3pm Tuesday.

Low concentrations of perfluorocarbons tracer gases, non-toxic, odorless, invisible gases commonly used for airflow testing, will be released at several subway and street-level stations in Manhattan to study how a potential gaseous incident will affect NYC. The S-SAFE program was commissioned through the $3.4 million grant from the Department of Homeland Security Transit Security, CBS New York reports.

"The NYPD works for the best but plans for the worst when it comes to potentially catastrophic attacks, such as ones employing radiological contaminants or weaponized anthrax," Police Commissioner Ray Kelly said, according to CBS New York. "This field study with Brookhaven's outstanding expertise will help prepare and safeguard the city's population in the event of an actual attack."