Exhibit 99.1 Arq Reports First Quarter 2024 Results Delivered materially improved YoY results in Q1 from PAC margin enhancement Achieved strategic milestone with first GAC contract for 20% of capacity at attractive pricing Red River expansion remains on schedule for first production in Q4 2024; expected payback of 3 years or less GREENWOOD VILLAGE, Colo., May 8, 2024 - GlobeNewswire - Arq, Inc. (NASDAQ: ARQ) (the "Company" or "Arq"), a producer of activated carbon and other environmentally efficient carbon ...