What are chemical toxicants? Describe in detail the exposure classes with reference to air, water and soil pollutants.

A toxic substance is a substance that can be poisonous or cause health effects. People are generally concerned about chemicals like polychlorinated biphenyls (PCBs) and dioxin which can be found at some hazardous waste sites. Products that we use daily, such as household ______ ___ ___ _________ ___.
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