EPA has issued a proposed rule setting national emissions standards for hazardous air pollutants (NESHAPs) for small and large industrial, commercial and institutional boilers that would require operators to install controls to reduce mercury, dioxins and hydrogen chloride emissions. The proposed rule would also require controls for carbon monoxide, which is used as a surrogate for organic air toxins, and for particulate matter, which is used as a surrogate for toxic metals. The proposed rule would amend 40 C.F.R. Part 63. EPA will schedule a public hearing on the proposed rule 15 days after it is published in the Federal Register and will accept public comments for 45 days after publication.