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Non-toxic gases to be released in NYC subway in terror-attack prep

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The NYPD will be conducting a subway gas-attack test on Monday.

By gassing the stations, the NYPD will be studying airflow in the event of a chemical attack.

The gases are said to be harmless, colorless, non-toxic and odorless. The tests with “tracer gases” will happen three times over the next twenty days.