“Regulatory agency” means:
1. The State Environmental Commission;
2. The State Department of Conservation and Natural Resources or the Division of Environmental Protection of that Department;
3. A district board of health acting as a solid waste management authority pursuant to NRS 444.440 to 444.620, inclusive; or
4. A district board of health, county board of health or board of county commissioners administering a program for the control of air pollution pursuant to paragraph (a) of subsection 1 of NRS 445B.500.