104 STAT. 2564 PUBLIC LAW 101-549—NOV. 15, 1990 Regulations. injury or property damages to any person which may result from accidental releases of such substances. " (2) DEFINITIONS.— "(A) The term 'accidental release' means an unanticipated emission of a regulated substance or other extremely hazardous substance into the ambient air from a stationary source. "(B) The term 'regulated substance' means a substance listed under paragraph (3). "(C) The term 'stationary source' means any buildings, structures, equipment, installations or substance emitting stationary activities (i) which belong to the same industrial group, (ii) which are located on one or more contiguous properties, (iii) which are under the control of the same person (or persons under common control), and (iv) from which an accidental release may occur. "(3) LIST OF SUBSTANCES. — The Administrator shall promulgate not later than 24 months after enactment of the Clean Air Act Amendments of 1990 an initial list of 100 substances which, in the case of an accidental release, are known to cause or may reasonably be anticipated to cause death, injury, or serious adverse effects to human health or the environment. For purposes of promulgating such list, the Administrator shall use, but is not limited to, the list of extremely hazardous substances published under the Emergency Planning and Community Right-to-Know Act of 1986, with such modifications as the Administrator deems appropriate. The initial list shall include chlorine, anhydrous ammonia, methyl chloride, ethylene oxide, vinyl chloride, methyl isocyanate, hydrogen cyanide, ammonia, hydrogen sulfide, toluene diisocyanate, phosgene, bromine, anhydrous hydrogen chloride, hydrogen fluoride, anhydrous sulfur dioxide, and sulfur trioxide. The initial list shall include at least 100 substances which pose the greatest risk of causing death, injury, or serious adverse effects to human health or the environment from accidental releases. Regulations establishing the list shall include an explanation of the basis for establishing the list. The list may be revised from time to time by the Administrator on the Administrator's own motion or by petition and shall be reviewed at least every 5 years. No air pollutant for which a national primary ambient air quality standard has been established shall be included on any such list. No substance, practice, process, or activity regulated under title VI shall be subject to regulations under this subsection. The Administrator shall establish procedures for the addition and deletion of substances from the list established under this paragraph consistent with those applicable to the list in subsection (b). "(4) FACTORS TO BE CONSIDERED. —In listing substances under paragraph (3), the Administrator shall consider each of the following criteria— "(A) the severity of any acute adverse health effects associated with accidental releases of the substance; "(B) the likelihood of accidental releases of the substance; and "(C) the potential magnitude of human exposure to accidental releases of the substance.