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