This document presents the draft emission standard for boilers, currently under public consultation. The purpose of the notified emission standard is to regulate emissions of particulate matter (PM), nitrogen oxides (NOx), sulphur dioxide (SO2), and mercury (Hg) from boilers, in order to prevent harm and protect human health and the environment. This regulation, the first national-level regulation in Chile, will apply throughout the territory to both new and existing sources, including cogeneration systems and waste-heat recovery boilers with auxiliary combustion.