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Homeland Security to conduct gas tests in T system

Homeland Security to conduct gas tests in T system 20 Aug 2010 Scientists will begin releasing airborne, non-toxic [we hope] contaminants into the MBTA subway system today to see how such gases would spread through the nation’s oldest subway system in the case of a terror attack. The test is being conducted in the nation’s 15 subway systems, and in Boston it will run through Aug. 27. While the study will primarily examine what would happen in the intentional release of chemical or biological agents, it will also look at the airflow characteristics for an 'accidental' spill, officials said.