The poisonous atmosphere is called a toxic atmosphere. It is an environment that contains toxic chemicals or other substances that can harm or even kill living organisms. Toxic atmospheres can be caused by a variety of sources, including industrial activities, natural disasters, and even certain plants and animals. Exposure to a toxic atmosphere can cause a range of health problems, from minor irritation to severe illness and even death. In some cases, toxic atmospheres can also cause long-term health problems, such as cancer and birth defects.