GREENWOOD VILLAGE, Colo., Sept. 30, 2026 (GLOBE NEWSWIRE) -- Arq, Inc. (NASDAQ: ARQ) (the "Company" or "Arq"), a producer of activated carbon and other environmentally efficient carbon products, today announced the publication of its 2025 Sustainability Report. The report gives a transparent account of a dynamic year for Arq, in which its core powdered activated carbon ("PAC") business continued to grow while the commissioning and subsequent pause of its granular activated carbon ("GAC") line brought challenges and lessons that will shape the Company's sustainability strategy going forward.