>>18061056
Calculations and extrapolations from more-realistic animal models have resulted in a concentration, lethal within ten minutes for 100% of all individuals, of some 4,400 mg of hydrogen cyanide per m3 of air, or some 0.4%. This is close to the concentration that used to be applied during executions in U.S. gas chambers, where the average time until death was reportedly about 10 minutes, with extreme cases up to almost 20 minutes.
Hence, in order to kill all individuals in a hypothetical gas chamber within ten minutes, an average concentration during those ten minutes of some 0.4% would have to be applied. Faster execution times would require proportionally higher concentrations, with a time of five minutes requiring almost 1% of HCN in the air, which is a commonly used concentration during fumigations, also in disinfestation chambers, in order to kill pests such as fleas and lice. (See Rudolf 2023, esp. pp. 227-236.)
