Both are deadly. Both are fairly easy to make.
Phosphine is an industrial gas available in compressed gas cylinders from lecture bottle size (not much bigger than a spray can) to rail tanker car. I've used it as a phosphorus source for semiconductor doping. IIRC, it's about 40 times more toxic than cyanide.
Phosgene - Carbon Monoxide Chloride is a war gas. Very nasty In contact with moist lung tissues it forms hydrochloric acid which damages the lungs. They fill up with fluid, the victims start drowning in their own fluids.
It also liberates Carbon Monoxide. What little oxygen the victims does manage to get into their lungs finds the hemoglobin bound up, the blood can't carry the oxygen to the rest of the body.
Very nasty.
yuk!
BAD NEWS!
THX FOR THE INFO!
Well then I would assume it's very easy to disperse in a large crowd. Easy to make. Are the ingredients easy to get without raising flags?
Could it be dispersed from a water truck or crop duster or model airplane?
From what I've learned about chemicals it's probably easier to disperse them inside without the wind factor. I never realized I would learn all these things in my life.
They are all scumbags, I want to be on the record for that!!