1. Short title This Act may be cited as the Protecting Communities from Hydrogen Cyanide Act of 2019 . 2. Protecting public health from hydrogen cyanide pollution Section 112(n) of the Clean Air Act ( 42 U.S.C. 7412(n) ) is amended by adding at the end the following: (8) Hydrogen cyanide (A) Numerical emission limitation The Administrator shall, by regulation— (i) set a numerical emission limitation for hydrogen cyanide from petroleum refineries; and (ii) require— (I) real-time fenceline air monitoring of emissions of hydrogen cyanide at each petroleum refinery and real-time online public reporting of such monitoring; (II) a community release alert system for residents exposed to emissions of hydrogen cyanide from a petroleum refinery; and (III) regular electronic reporting to the Administrator of all monitoring data related to emissions of hydrogen cyanide from each petroleum refinery. (B) Requirements In setting a numerical emission limitation under subparagraph (A), the Administrator shall— (i) require the maximum degree of reduction in emissions that the Administrator determines is achievable, in accordance with subsection (d); (ii) ensure an ample margin of safety to protect public health and prevent an adverse environmental effect; (iii) prevent adverse cumulative effects to fetal health, children’s health, and the health of vulnerable subpopulations; (iv) consider the effects and risks of exposure to hydrogen cyanide from multiple sources and in combination with exposure to other pollutants