The EPA released final emission factors for the following ordnance categories: Fuses [Fuzes] and Primers; Mines and Smoke Pots; Grenades; Projectiles, Canisters and Charges; Large Cartridges (>75mm); and Small Arms. The air emission factors for ordnance are documented in Chapter 15 (Ordnance Detonation) of EPA's AP-42 (5th edition, Volume I). EPA's effort to develop and capture air emissions factors for ordnance has been a work in progress which started several years back when the Army first developed emission factors for nine ordnance items through testing conducted at Dugway Proving Grounds (a.k.a. bang box tests) and the Army Environmental Center. The ordnance for which emission factors were first developed included a 155mm illumination round, green and white star signal flares, and simulators (flash artillery, booby trap, and hand grenade).

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The EPA published a notice of availability of the Draft Munitions and Explosives of Concern (MEC) Hazard Assessment Guidance in the Federal Register. The hazard assessment model was put together by the Technical Working Group for Hazard Assessments which was made up of representatives from the EPA, DoD, Department of the Interior, various State regulatory agencies, and Tribes. The MEC Hazard Assessment model evaluates explosives safety risk by looking at three components severity, accessibility, and sensitivity. There are various input parameters that make up each of the 3 components. In all, there are nine separate input factors or parameters that are assessed for each site including 2 for the severity component, 5 for the accessibility component, and 2 for the sensitivity component.

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An international treaty negotiated through the United Nations governing the cleanup of UXO left from war went into effect when it was ratified by 26 states. The treaty known as the Protocol on Explosive Remnants of War requires parties to an armed conflict to:

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