https://www.lapatilla.com/2017/04/10/bombas-lacrimogenas-que-usa-el-gobierno-estan-vencidas-y-emanan-cianuro-recomendaciones/
"A tear pump that is expired breaks down into
cyanide,
phosgene and nitrogen oxides that are extremely dangerous," warns the chemist.
山埃
光氣,唔怪得之會起水泡