NTI- Global Security Newswire, 3 Dec 2009.

The U.S. Homeland Security Department plans to study the circulation of airborne contaminants through public transit networks next week by releasing harmless gases and dye tracers in Boston's subway system.

The study, aimed at examining how smoke and airborne toxins move, is expected to assist in the development of future chemical-agent monitoring and to provide guidance for improving air-purification systems, evacuation plans and emergency-response protocols for transportation systems.

"This study is one of many efforts the department is undertaking across the country to inform our emergency response planning in preparation for chemical or biological terrorist attacks," Homeland Security Secretary Janet Napolitano said in a press release announcing the study.

"This project -- combining the resources and expertise of scientists from around the world -- will refine best practices for responding to the release of toxic gas or chemicals in public transportation systems," Homeland Security Undersecretary Tara O'Toole added in the statement.

The study is begin Saturday and run through Dec. 11 in more than 20 below-ground subway stations and trains overseen by the Massachusetts Bay Transportation Authority

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