Question: You are about to enter a vessel. Testing has shown that the oxygen level is normal, there are no flammable vapors but you do NOT

You are about to enter a vessel. Testing has shown that the oxygen level is normal, there are no flammable vapors but you do NOT know what toxins are in the atmosphere. Do you choose an airpurifying or air-supplying respirator?
 You are about to enter a vessel. Testing has shown that

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