The phrase "use of toxic chemicals" refers to the application or employment of hazardous, poisonous substances that can cause harm to living organisms. These chemicals are often used in industrial processes, agriculture, and other sectors where they may be necessary for certain tasks but also pose a risk to human health and the environment if not handled properly. The term "toxic" refers to something that is poisonous or capable of causing death or injury when ingested, inhaled, or absorbed through the skin.