Database users must exercise their judgement.
Persistence is related to delivery means, weather, vegetation, humidity, and other factors.
The action column describes the relative speed of the agent on exposed personnel. However, agents can be mixed with other materials, altering their signatures. Physiological effects were not added to the table, nor was nation or origin. Oftentimes, agents cause certain effects when inhaled, others when ingested, and still others when absorbed. Nation of origin was regarded as immaterial, given the relative ease of producing most agents.