deleterious gases in a sentence

1. Refining is done to remove deleterious gases and elements from the molten metal to avoid casting defects.
2. A separate declaration stated that in any war between signatory powers, the parties would abstain from using projectiles " the object of which is the diffusion of asphyxiating or deleterious gases ."
3. In 1899, 35 nations, including Germany but not the United States, signed a declaration at The Hague agreeing to " abstain from the use of projectiles, the object of which is the diffusion of asphyxiating or deleterious gases ."
4. It's difficult to find deleterious gases in a sentence.