The most characteristic symptom of individuals occupationally exposed to PCBs is:

Chloracne is recognized as the most characteristic symptom associated with occupational exposure to polychlorinated biphenyls (PCBs). This skin condition resembles acne and is specifically linked to exposure to certain chlorinated hydrocarbons, including PCBs, dioxins, and related compounds. Its appearance can take weeks to months after exposure and is notable for the development of cysts and pustules primarily on the face and upper body.

In the context of PCB exposure, chloracne serves as a vital indicator for medical professionals assessing the health effects of such exposure. While liver cancer, visual disturbances, and physical tremors can also be outcomes of prolonged or high-level exposure to PCBs, they are not as distinctively associated with PCB exposure as chloracne. The fact that chloracne occurs as a direct result of exposure highlights the unique relationship between the symptom and the chemical, making it a standout symptom for individuals working in environments where PCBs are present.