In this episode, Professor David Crouch, 3M’s Global Subject Matter Expert – Application Engineering (Defence & Public Safety) joins host Mark Reggers for the first of a two-part series to discuss respiratory protection as it relates to chemical, biological, radiological and nuclear hazards. CBRN is an acronym for Chemical, Biological, Radiological and Nuclear. It is a terminology used worldwide that refers to malicious incidents or weapons in which any of the four types of hazards mentioned are used to cause significant harm or disruption. It encompasses the protective measures taken in these situations and consists of passive protection, contamination avoidance and mitigation.