Section 52.985 - Visibility protection(a)Measures addressing best available retrofit technology (BART) for electric generating unit (EGU) emissions of nitrogen oxides (NOX). The BART requirements for EGU NOX emissions are satisfied by § 52.984 .(b)Other measures addressing BART. The BART requirements for emissions other than EGU NOX emissions are satisfied by the Louisiana Regional Haze SIP approved December 21, 2017.82 FR 60543, Dec. 21, 2017