Industrial producer gas generally produces 5 percent aromatics by weight of feedstock with their light tar(the stuff diy gasifiers have to clean out) being roughly 70 percent benzene and toulene. There’s not data on diy gasifiers but expect it to be worse, with more varied polycyclics that likey much more toxic that aren’t particularly filtered out by bubbling it through water. These heavy polycyclics are generally eliminated in the gasoline cracking stage.
Industrial producer gas generally produces 5 percent aromatics by weight of feedstock with their light tar(the stuff diy gasifiers have to clean out) being roughly 70 percent benzene and toulene. There’s not data on diy gasifiers but expect it to be worse, with more varied polycyclics that likey much more toxic that aren’t particularly filtered out by bubbling it through water. These heavy polycyclics are generally eliminated in the gasoline cracking stage.