EPA is proposing two separate and distinct actions under CAA section 129. In the first action, the EPA proposes to consolidate the existing provisions governing air curtain incinerators (ACI) that only burn wood wastes, yard wastes, and clean lumber into one new rule subpart. Specifically, EPA is proposing to consolidate the opacity limitations and associated monitoring, recordkeeping, and reporting requirements that currently exist. EPA is also proposing to remove the permitting requirement for this type of ACI that are not located at major sources or subject to federal permitting requirements for other reasons. The proposed removal would not cover ACI that are currently subject to OSWI or LMWC rules which have already been amended to remove such permitting requirements. In the second action, the EPA proposes to include in the CISWI rule subparts provisions for the temporary use of CISWI units to combust debris from a qualifying disaster or emergency on a temporary basis without complying with CAA section 129 requirements that would otherwise apply to CISWI units for the combustion of commercial and industrial waste during normal operations. These additional provisions would bring the CISWI rule subparts into alignment with existing OSWI provisions that allow such temporary use of OSWI units to combust debris from a disaster or emergency. Comments must be received on or before 4 May 2026. POC is Tianzhen Nie, tele: (919) 541-1815 and email: nie.tianzhen@epa.gov. (Federal Register 20 March 2026 [Proposed Rule] Pages 13543-13559)