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

Chemical toxicants are substances that, when introduced into the environment or the human body, can cause harm by disrupting normal biological processes. These toxicants can be natural or synthetic compounds, and their effects can range from mild irritation to severe illness or even death. Environmental toxicology is the field of study that focuses on understanding the adverse effects of chemical toxicants on living organisms and ecosystems, as well as the mechanisms and pathways by which these effects occur.

Exposure to chemical toxicants can occur through various routes, including air, water, and soil. Each of these exposure routes has its own unique characteristics and challenges in terms of assessing and mitigating the risks associated with chemical toxicants.

1. Air Pollutants:
Air pollutants encompass a wide range of toxicants released into the atmosphere. These toxicants can originate from natural sources like volcanoes or wildfires, but the majority are anthropogenic, generated by human activities such as industrial processes, transportation, and energy production. Common air pollutants include particulate matter (PM), volatile _______ ______ ___ ___ ______ _________.
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