On September 30, 2020, the Region issued a Unilateral Administrative Order (Order), which requires Excelitas Technologies Corp. to perform a process hazard review under the Clean Air Act's General Duty Clause at the company's electrical component designing and manufacturing facility located in Salem, Massachusetts. The company handles extremely hazardous substances, including anhydrous ammonia, hydrogen gas, hydrofluoric acid, nitric acid, sulfuric acid, and potassium cyanide.