As noted in my examples, the NYT regularly uses 'fallout' to refer to non-radioactive toxics emerging from explosions and other activities as well. This usage is also confirmed by many dictionaries.
The use of "toxic fallout" in the 1st link is pretty clearly referring to literal toxic chemicals released. And if you remove the '.' from the 2nd link, you'll see the same in the "toxic fallout" headline there.