Final answer:
Vesicants/blister agents, such as nitrogen mustard, would fall under hazard class and division 6.1.
Step-by-step explanation:
Vesicants/blister agents, such as nitrogen mustard, would fall under hazard class and division 6.1. This class is for toxic substances that can cause severe damage to human health or the environment. Division 6.1 specifically includes poisonous substances that have a primary toxic effect on humans.