Which gas is associated with the color blue and is considered an irritant?

The gas associated with the color blue and recognized as an irritant is CS. This chemical compound, commonly known as tear gas, is widely used in crowd control and self-defense situations. CS gas produces a strong irritant effect, causing symptoms such as tearing, coughing, and eye irritation. The blue color is commonly associated with CS gas canisters, making it easily identifiable in various contexts.

In various situations, CS has been preferred due to its quick onset of effects, allowing for effective disbanding of crowds or incapacitating targets in self-defense scenarios. Consequently, CS gas is integral in law enforcement and military training, emphasizing the importance of understanding its properties, effects, and identification in the field.