least four classes: nerve, blister, choking, and blood agents
The film deals with various forms of biological weapons such as bacteria (anthrax), viruses (cholera, smallpox) and chemical weapons such as Agent Orange, mustard gas and nerve and blood agents
In a June supplement to ENVIRONMENTAL HEALTH PERSPECTIVES, Schwartz reports that of all the pollutants measured, only fine particulates--those smaller than 10 micrometers in diameter--were associated with higher than normal concentrations of these blood agents
Nerve agents, such as tabun and satin, and blood agents
, such as hydrogen cyanide and cyanogen chloride, have particularly lethal effects and can cause death within minutes.