How long does zyclon b stay?

Zyklon B, a pesticide that was infamously used during the Holocaust, contains hydrogen cyanide as its active ingredient. The persistence of hydrogen cyanide in the environment depends on various factors such as temperature, humidity, and ventilation. In general, it can evaporate quickly in open air, but residues may remain on surfaces for varying lengths of time. In enclosed spaces, the effects can linger longer, necessitating thorough decontamination.