"The gases are used to light like a flare and send large volumes of sulfur-based smoke into a gopher..."

“The gases are used to light like a flare and send large volumes of sulfur-based smoke into a gopher hole to suffocate the rodents. The bombs produce a concussion that kills the gophers or scares them away, he said.”

- My dad, in a interview to the local news about a hazmat removal in the city he works in. This is what my dad knows about, gopher killing.