[KarlInOhio]

And phosgene's dosage as an irritant is above the dangerous level. From https://emedicine.medscape.com/article/832454-overview

According to the National Institute for Occupations Safety and Health (NIOSH), a toxic level that can place a person’s life and well-being in jeopardy can be as low as 2 parts per million (ppm). [1] Exposure to moderate-to-high concentrations of phosgene (>3-4 ppm) can produce an immediate irritant reaction that typically lasts 3-30 minutes and includes the following:

Lacrimation
Conjunctival irritation/burning
Burning sensation in mouth/throat
Throat swelling/changes in phonation - May reflect laryngeal edema

So the potentially deadly dose is half the dose needed to affect and potentially disperse a crowd. The FBI's hostage "rescue" team wasn't even that gas crazy at the Waco Massacre.

[HenpeckedCon]

I remember NBC training well.