Which of the following is considered an airborne contaminant?

Dust is identified as an airborne contaminant because it consists of tiny particles that can remain suspended in the air for an extended period. When disturbed, these particles can travel through the air and settle on surfaces, potentially carrying biological agents, pollutants, or other contaminants. This characteristic of dust makes it significant in various contexts, such as environmental monitoring, workplace safety, and crime scene analysis, where airborne contaminants can affect the integrity of evidence collection and the overall safety of investigators.

In contrast, urine, breast milk, and blood are all bodily fluids that are typically not airborne at standard conditions. Instead, they are considered primarily as liquid contaminants. While they can become aerosols under certain circumstances (for example, during violent actions or while being sprayed), their nature as fluids distinguishes them from airborne particulates like dust. Thus, when discussing airborne contaminants specifically, dust stands out as the primary example.