Poison Gas -

: Cause severe chemical burns and painful blistering on contact. Mustard gas is the most well-known agent in this category.

Poison gas was first used on a large scale during World War I to break trench stalemates. First Usage of Poison Gas - National WWI Museum poison gas

: Cause inflammation and chemical burns to the respiratory tract, eyes, and skin. Common examples include ammonia , chlorine , and sulfur dioxide . : Cause severe chemical burns and painful blistering