👉 Fumes serve as a warning or indicator of hazardous substances in the air, often emitted by industrial processes, chemical reactions, or combustion. Their primary purpose is to alert individuals to potential health risks, such as respiratory irritation, poisoning, or long-term damage, by signaling the presence of toxic or noxious gases and particulates. This early warning helps prevent exposure, allowing people to take protective measures like wearing respirators or evacuating the area, thereby safeguarding health and safety in environments where fumes are present.