The chemicals used in tent fumigation typically include sulfuryl fluoride, the most common fumigant. It is a colorless, odorless gas that effectively penetrates wood and other materials to kill pests. Chloropicrin, a warning agent with a strong odor, is sometimes used alongside sulfuryl fluoride to alert humans if there is a leak. These fumigants are highly regulated, and professionals follow strict protocols to ensure safety during and after fumigation.