Smoke School Information in West Virginia

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

Accepted.

West Virginia Acceptance Letter »

West Virginia Visible Emissions / Opacity Standard

The opacity limit for West Virginia is 20% opacity (process operations per 45 CSR 6); 10% opacity (fuel-burning indirect heat exchangers per 45 CSR 2), as established under 45CSR7 (manufacturing processes: 20%).

Compliance is demonstrated via EPA Method 9 (40 CFR Part 60, Appendix A); COMS for continuous monitoring; WVDEP observer must be Method 9 certified.

Averaging period: 6-minute average (per Method 9 protocols)

West Virginia has an unusually strict 10% opacity standard for fuel-burning indirect heat exchangers (boilers) under 45 CSR 2, which is tighter than most states. General process industry sources are held to 20% under 45 CSR 6. WVDEP has a notable compliance inspection program for opacity at industrial facilities.

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.