October 22, 2026 Katherine Quinlan NC Division of Air Quality 1641 Mail Service Center Raleigh, North Carolina 27699-1641 da****************@****nc.gov Electronic Filing via Email to da****************@****nc.gov (Subject: NC RH SIP) Re: Comments on the Proposed Supplement to Regional Haze State Implementation Plan (SIP) for North Carolina Class I Areas for the Second Planning Period (2019–2028) Dear