A new federal rule will tighten hazardous-air-pollutant standards for plywood and composite wood products plants, including dryers, presses, refiners and lumber kilns. The final rule is effective July 6, 2026. The rule will cover 219 existing major-source facilities, including 93 plywood and composite wood products facilities and 126 kiln-dried lumber facilities. Six new facilities are expected to become subject to the standards in the five years after the rule’s proposal. The standards will limit total hazardous air pollutants, including acetaldehyde, acrolein, formaldehyde, methanol, phenol and propionaldehyde. They will also set limits or work practices for mercury, hydrogen chloride, polycyclic aromatic hydrocarbons, dioxin/furan, methylene diphenyl diisocyanate and non-mercury hazardous-air-pollutant metals. The rule is expected to cut hazardous-air-pollutant emissions by 721 tons a year. …The rule is expected to require $121 million in total capital costs and $53.5 million in annualized costs, measured in 2024 dollars. Average annual compliance costs are estimated at $237,680 per facility.