Chemicals used in the fumigation process typically include sulfuryl fluoride, a colorless and odorless gas that effectively penetrates wood, walls, and other materials to kill pests. Chloropicrin, a warning agent with a strong odor, is often added to sulfuryl fluoride to help detect leaks. These fumigants are strictly regulated and do not leave residual traces after aeration. Other fumigants like methyl bromide may be used in specific agricultural or industrial contexts, though their use is heavily restricted due to environmental concerns.