A hazardous atmosphere is an environment where the air contains harmful substances that can pose risks to health and safety. This can include the presence of toxic gases, flammable vapors, or insufficient oxygen levels. Common examples of hazardous atmospheres are found in confined spaces, such as sewers, tanks, or mines, where air quality can quickly deteriorate. Workers in hazardous atmospheres must use protective equipment and follow safety protocols to minimize risks. Monitoring devices can detect dangerous levels of carbon monoxide, hydrogen sulfide, or other harmful agents. Proper training and awareness are essential to ensure safety in these environments.