How is VX different from sarin in how long it remains dangerous?
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chemical weapon
American soldiers participating in a simulated gas attack exercise, World War I.
VX and sarin are both highly toxic nerve agents that disrupt the nervous system, but they differ significantly in their persistence in the environment.
VX is classified as a very persistent agent. If released, it can remain in the environment for days to weeks before evaporating, depending on factors such as temperature, humidity, and wind.1
In contrast, sarin is generally considered a nonpersistent agent. While both are lethal organophosphates that can cause death within minutes of exposure, sarin is much more volatile than VX, meaning it evaporates much more quickly and does not remain a long-term hazard in the environment in the same way that VX does.123