"De minimis mercury emissions" means mercury emissions from a thermal unit that emits mercury which are determined by the Director pursuant to NAC 445B.3657 to be insufficient to require compliance with the requirements for a mercury operating permit or the application of NvMACT as set forth in the Nevada Mercury Air Emissions Control Program established pursuant to NAC 445B.3655.
Nev. Admin. Code § 445B.3613
NRS 445B.210, 445B.300