For safety reasons,rescue workers should be upwind and uphill from a toxic chemical disaster scene to avoid exposure.The exception is when ____________ has been released,because it is lighter than air.

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The Answer of For safety reasons,rescue workers should be upwind and uphill from a toxic chemical disaster scene to avoid exposure.The exception is when ____________ has been released,because it is lighter than air.

For Safety Reasons,rescue Workers Should Be Upwind and Uphill from a Toxic