Which chemical agent is associated with the color code blue and described as having a pepper smell?

The chemical agent associated with the color code blue and known for its pepper smell is CS, or orthochlorobenzalmalononitrile. This compound is a common tear gas used for crowd control and self-defense due to its irritating effects on the eyes and respiratory system. CS is recognized for producing a strong burning sensation in the eyes and can cause temporary blindness, making it effective for disperseing crowds or in military operations. The distinct pepper-like smell is characteristic of this chemical, distinguishing it from other agents.

Other chemical agents like HC, CN, and OC have their own specific characteristics and uses but do not match the description given regarding the color code and aroma. HC (smoke) does not have a pepper scent; CN (Mace) is known as a different type of tear gas with a chemically distinct profile; while OC refers to oleoresin capsicum, commonly known as pepper spray, which also has a different color code. Therefore, CS is the correct answer based on the criteria provided.