Arq 

Arq, Inc. produces activated carbon products in North America. The company's products include granular activated carbon, powdered activated carbon, and colloidal carbon products; Arq Powder Wetcake, a fine and low-ash coal waste-derived particle; and additives for air emissions control. Its products are used in various applications, including; water treatment, ground water remediation, soil sediments, air emissions, and asphalt additives. The company was formerly known as Advanced Emissions Solutions, Inc. and changed its name to Arq, Inc. in February 2024. The company was founded in 1996 and is headquartered in Greenwood Village, Colorado.