Can be released via unintended means such as a spill from a damaged railroad tank car or industrial explosion as well as by intentional means as<unk> .
Higher metabolic rate and faster basal respiratory rate, causing more rapid and larger exposures
Skin is thinner and more permeable
Agents heavier than air have increased concentrations closer to the ground exposing children > adults
Chemical weapons
Radiation exposure 
Caustic cocktail
Dirty bomb
Bioterrorism
Care under fire
Mass shooting
Hazmat exposure