Chemical contamination occurs when harmful chemicals are introduced into the environment, affecting air, water, or soil quality. This can happen through various sources, such as industrial waste, agricultural runoff, or improper disposal of hazardous materials. These contaminants can pose risks to human health, wildlife, and ecosystems. Common examples of chemical contaminants include heavy metals like lead and mercury, pesticides used in farming, and industrial solvents. Monitoring and regulating these substances is essential to prevent adverse effects and ensure a safe environment for all living organisms.