Paradichlorobenzene is a chlorinated aromatic hydrocarbon. It is a fumigant insecticide and repellent. Paradichlorobenzene turns directly from a solid into a gas, a process called sublimation. The target organisms are molds, mildews, and insects, but paradichlorobenzene can also be toxic to people and other animals. Most pesticide products containing paradichlorobenzene in the U.S. are used to control clothes moths in airtight containers. Paradichlorobenzene was first registered for use in the United States in 1942, and it is sometimes called 1,4-dichlorobenzene.