The term "chemicals in the environment" refers to any man-made or natural substances that are present in the air, water, soil, and other surroundings. These chemicals can include pollutants such as pesticides, heavy metals, volatile organic compounds (VOCs), and other contaminants released into the environment through human activities like manufacturing, transportation, agriculture, and waste disposal. They can also refer to naturally occurring substances like radon gas or trace elements in water. The presence of these chemicals in the environment can have various effects on ecosystems, wildlife, and humans, ranging from acute poisoning to long-term health issues.