Tear gas such as CN and CS is used for crowd control and falls under which category?

Tear gas, specifically CN (Chloroacetophenone) and CS (o-chlorobenzylidene malononitrile), is classified as a chemical agent. This category includes substances that are specifically designed to incapacitate or control individuals through chemical reactions rather than through physical force or conventional weaponry.

Chemical agents like tear gas work by causing a temporary irritation of sensory organs, particularly the eyes and respiratory system, leading to tearing, coughing, and disorientation. This reaction is essential for crowd control scenarios, as it is intended to disperse large groups of people without causing permanent harm.

In contrast, choking agents typically target the respiratory system and cause suffocation, while blood agents affect the body's ability to transport oxygen. Biological agents involve pathogens that can cause disease, which is distinctly different from the irritant properties of tear gas. Understanding these classifications helps in recognizing the intended uses and safety measures associated with various agents used in emergency situations.