Aromatic compounds can be toxic to most organisms, including humans, depending on their chemical structure and concentration. Some aromatic compounds, such as benzene, toluene, and xylene, are known to be highly toxic and carcinogenic to humans, causing serious health effects such as leukemia, anemia, and other blood disorders.

Aromatic compounds can also be harmful to aquatic and terrestrial organisms. They can accumulate in soil, water, and air, and can persist for long periods, leading to bioaccumulation and biomagnification in food chains.

Polycyclic aromatic hydrocarbons (PAHs) are a class of aromatic compounds that are of particular concern due to their toxic and carcinogenic properties. PAHs are commonly found in industrial pollution, vehicle exhaust, and cigarette smoke. They can cause respiratory problems, skin irritation, and cancer in humans and other animals.

Overall, it is important to handle aromatic compounds with care and to minimize their release into the environment to prevent harm to living organisms.