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

Chemical toxicants are substances that have the potential to cause harm to living organisms by interfering with normal physiological processes when they are present at a certain concentration or under certain conditions. These toxicants can be naturally occurring or human-made, and their adverse effects on the environment and living organisms are a subject of study within the field of environmental toxicology. In this context, it is essential to understand the exposure classes associated with chemical toxicants in air, water, and soil, as each medium poses unique challenges and risks.

1. Air Pollutants:
Air pollutants refer to chemical toxicants released into the atmosphere that can have adverse effects on both the environment and human health. These pollutants are often classified into several exposure classes:

a. Particulate Matter (PM): Particulate matter includes tiny solid or liquid particles suspended in the air. These particles can vary in size, with fine particles (PM2.5) and coarse particles (PM10) being the most concerning. They originate from sources ____ ________ _____ ___ __________ ______ _____ _______.
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