The term "harmful agents" refers to substances or organisms that can cause harm, injury or disease to humans, animals or plants. These could include chemicals, bacteria, viruses, fungi, parasites and other pathogens which have the potential to disrupt normal bodily functions, damage cells or tissues, or interfere with the immune system. Exposure to harmful agents can result in a wide range of health problems, from mild irritation or allergic reactions to severe illnesses and even death. Therefore, preventing exposure to these substances is crucial for maintaining good health and safety.