Boron trichloride

Made and used in industry for plasma etching/doping in electronics, as a reagent/catalyst, and in metal refining; releases can occur from leaks, transfers, or transport incidents [1][3].

Mainly by breathing contaminated workplace air; the public may be exposed during accidental releases near facilities or transport routes [2][3].

Irritates and corrodes the respiratory tract, skin, and eyes; high exposures can cause severe breathing trouble and delayed lung injury (pulmonary edema). It forms corrosive hydrochloric acid on contact with moisture [1][2][3].

Semiconductor and chemical workers, metal refiners, lab staff, and emergency responders; people close to industrial sites during a release [1][3].

At work, use closed systems, local exhaust, gas monitoring, and proper PPE; follow spill/leak plans. During a release, move away or shelter indoors with windows/vents closed and follow local guidance; do not use water on spills [1][2][3].