Smoke School Information in Nevada

Nevada Acceptance Status for VirtualOpacity^® — EPA ALT-152A

Pending Acceptance.

Nevada Visible Emissions / Opacity Standard

The opacity limit for Nevada is 20% opacity (no discharge equal to or greater than 20%); NSPS Subpart D/Da units allowed one 6-min period per hour up to 27%, as established under NAC 445B.22017(1); uncombined water exemption at (2); NSPS Subpart D/Da allowance at (3).

Compliance is demonstrated via EPA Reference Method 9 (40 CFR Part 60, Appendix A); COMS data reduced to 6-minute averages.

Averaging period: Method 9; COMS data reduced to 6-min averages per 40 CFR 60.13(h)

NAC 445B.22017 sets the general 20% opacity standard. Sources subject to 40 CFR Part 60 Subpart D or Da are allowed one 6-minute period per hour up to 27% opacity as specified in those NSPS. Water vapor exceedances not violations.

Last verified July 8, 2026

Note: Regulations change — always verify current requirements with your state's air quality agency before making compliance decisions. This page is for informational purposes and is not legal advice; consult a qualified attorney or environmental compliance professional for guidance specific to your facility.