The largest users of MCB are companies that make nitrochlorobenzene. Companies also use MCB to make adhesives, paints, paint removers, polishes, dyes, and drugs. Exposure to chlorobenzene can occur in the workplace or in the environment following releases to air, water, land, or groundwater. It can also be absorbed through skin contact. MCB does not remain in the body due to its breakdown and removal.
Chlorobenzene can evaporate when exposed to air.
It dissolves slightly when mixed with water. Most releases of chlorobenzene to the U.S. environment are to air. MCB also can evaporate from water and soil exposed to air. Once in air, MCB breaks down to other chemicals. Because it is a liquid that does not bind well to soil, MCB that makes its way into the ground can move through the ground and enter groundwater.