The Spread
The previous sections listed eight of the most-feared chemical and biological agents. There are dozens of others that are less well known, either because they are not as toxic or not as easy to spread.

There are three ways to spread a chemical or biological agent so that it would infect a large number of people:

  • Through the air
  • Through a municipal water supply
  • Through the food supply
The most-feared scenario is through the air. Here are the techniques most commonly discussed:
  • A bomb or a missile explodes, spreading the chemical or biological agent over a wide area.
  • A crop-duster or other aircraft sprays the agent over a city.
  • A car or truck drives through the city spraying a fine mist along city streets in crowded areas.
  • Small bombs or aerosol canisters are released in crowded areas like subways, sports arenas or convention centers.
To learn more about toxic agents, how they're spread and methods the military uses to protect soldiers against them, check out the links on the next page.