10 "PM10" means any particulate matter in the atmosphere with an aerodynamic diameter less than or equal to a nominal 10 micrometers as measured by an approved reference method or equivalent method based on 40 C.F.R. Part 50, Appendix J and designated in accordance with 40 C.F.R. Part 53.
Nev. Admin. Code § 445B.135
NRS 445B.210