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Re:War Elephants, Part II: Elephants Against Wolves (2019) by Retric on Friday October 23, 2020 @06:23PM (#24874942)
Dispersal is a well studied problem: https://fas.org/programs/bio/chemweapons/delivery.html

But to simplify, cluster mutinous are more effective vs troops than a single large detonation. Similarly, rather than starting from a single source you want to spread the weapon from a large number of points. By comparison to 7mg/m3 a 1 metric ton weapon could ideally cover a square kilometer to a thickness of 30m and concentration of 30mg/m3.

Notably, exposure time plays a major role in lethality so covering a wider area makes it much harder to escape from.

Re:War Elephants, Part II: Elephants Against Wolves (2019) by mcguire on Friday October 23, 2020 @07:15PM (#24875396)
How long does the gas cloud last, in various wind conditions?
Re:War Elephants, Part II: Elephants Against Wolves (2019) by Retric on Friday October 23, 2020 @07:28PM (#24875491)
Really depends on local conditions, but as a benchmark https://en.wikipedia.org/wiki/Ghouta_chemical_attack

Estimates of the death toll range from at least 281 people[3] to 1,729.[14] and 3,600 patients displaying neurotoxic symptoms in 3 hospitals supported by MSF[5]

However, it was considered safe enough for the UN to inspect the area the next day.