Blood agents are chemical weapons that kill after being inhaled and then absorbing into the blood.
Blood agents include cyanide and arsenic based vapour but some lists also include Phosgene and various other chemicals as blood agents.
Generally blood agents only pose an inhalation risk in enclosed spaces, so wearing a respirator with an AB filter or NBC/CBRN filter will provide adequate protection.
The vapour may pose a threat from skin absorption in very high concentrations.

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