On June 4 2010, EPA published its Notice of Proposed Rulemaking on “National Emission Standards for Hazardous Air Pollutants for Major Sources: Industrial, Commercial, and Institutional Boilers and Process Heaters” in the June 4, 2010 Federal Register. 75 Fed. Reg. 32,006 (June 4, 2010) (“Boiler MACT” NPRM”).