For example, Canada added ammonium nitrate to Schedule 1 of the Environmental Emergency Regulations (E2) in 2011. We can do the same here in the USA, adding A-N to the list of extremely hazardous substances (EHS) defined in Section 302 of the U.S. Emergency Planning and Community Right-to-Know Act (42 U.S.C. 11002). Appendix 40 C.F.R. 355.
2005 presentation by Jean-Paul Lacoursiere, Eng., Associate Professor, Université de Sherbrooke, Canada. Excellent insight on the explosion hazards of ammonium nitrate resulting in the need for facility and community emergency planning, prevention, preparedness, and mitigation. This information assisted immensely with A-N added to Schedule 1 of the Canada Environmental Emergency Regulations (E2) six years later.
NOTE: NFPA 490 Code for the Storage of Ammonium Nitrate was withdrawn in Annual 2009 and incorporated into NFPA 400 Hazardous Materials Code.