Smoke School Information in Kentucky

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

Accepted.

Kentucky Acceptance Letter »

Kentucky Visible Emissions / Opacity Standard

The opacity limit for Kentucky is New process operations: 20% opacity (continuous emissions from control device/stack); existing process operations: 40% opacity per 401 KAR 61:020 Sec. 3(1)(a) (confirmed via reg text and current EPA-issued Title V permit V-21-016 R1), as established under 401 KAR 59:010 Sec. 3(1)(a) (new process operations); 401 KAR 61:020 Sec. 3(1)(a) (existing process operations).

Compliance is demonstrated via EPA Reference Method 9; Kentucky Method 150(F-1) for intermittent emissions; filed by reference in 401 KAR 50:015.

Averaging period: Continuous emission standard; intermittent emissions (≤3 min) measured by Kentucky Method 150(F-1)

Kentucky's visible emissions program spans multiple regulations. 401 KAR 59:010 (new process operations) and 401 KAR 63:010 (fugitive emissions) are key references. Kentucky has its own test method (150(F-1)) for short-duration (intermittent) emissions of 3 minutes or less.

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.