Smoke School Information in Missouri

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

Pending Acceptance.

Missouri Visible Emissions / Opacity Standard

The opacity limit for Missouri is 20% opacity (all stationary sources of visible emissions throughout Missouri, with specific exemptions), as established under 10 CSR 10-6.220(3)(A).

Compliance is demonstrated via EPA Method 9 (40 CFR 60, Appendix A-4); or ALT-082 (photogrammetric/camera-based opacity measurement) — Missouri was one of the first states to explicitly adopt ALT-082 as an approved compliance method.

Averaging period: 6-minute average; COMS data reduced to 6-minute averages per 40 CFR § 60.13(h)

Missouri explicitly permits ALT-082 (EPA-approved camera-based alternative to Method 9) as a compliance method — relevant to VirtualOpacity® positioning. Rule applies to all stationary sources with specific exemptions for natural gas combustion, certain MACT-regulated units, and fugitive emissions subject to 10 CSR 10-6.170.

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.