Dichlorobenzene mainly refers to p-dichlorobenzene and o-dichlorobenzene, which are important fine chemical raw materials. The systematic nomenclature of o-dichlorobenzene is written as 1,2-dichlorobenzene, also referred to as o-DCB. After inhaling 1,2-dichlorobenzene, respiratory irritation, headache, dizziness, anxiety, anesthesia, and unconsciousness occur. Liquid o-dichlorobenzene and high-concentration o-dichlorobenzene vapor are irritating to the eyes and can be absorbed through the skin to cause poisoning, with symptoms similar to inhalation. Oral administration causes gastrointestinal reactions. Skin contact can cause erythema and edema. o-dichlorobenzene is flammable, toxic and irritating.