Abstract: A portable apparatus for mitigating the effects of chemical, biological aor radiological agent containing explosive devices within a defined area is disclosed. The apparatus is an inflatable, easily portable containment device and includes: explosive blast containment means for substantially containing explosive blast over-pressure and blast fragmentation particles caused by an explosive blast to a substantially defined area; chemical, biological and/or radiological agent mitigation means for substantially mitigating the effects of an explosively deployable chemical, biological and/or radiological agent within the substantially defined area; and an inflatable air-beam suspension support structure having a substantially open base portion, a plurality of lateral support members and a capping structure which, when inflated, establishes the substantially defined area and supports the blast containment and agent mitigation means.