Three contractors in the suit inhaled toxic amounts of the chemical and ended up in the hospital dealing with neurological disorders and respiratory issues.

The Pemex refinery chemical leak killed 2, injured dozens and forced shelter-in-place orders in Deer Park and Pasadena. They have since been lifted.

At least two workers at a Houston-area oil refinery were killed when hydrogen sulfide leaked at the plant, setting off urgent warnings for nearby residents to stay indoors before authorities determined the public wasn't in danger.