In the context of hazardous materials, what does the term 'ceiling limit' refer to?

The term 'ceiling limit' specifically refers to the maximum concentration of a substance in air that is considered safe for exposure. This means that when the concentration of a hazardous material reaches this ceiling limit, it should not be exceeded at any time to ensure the safety and health of individuals in that environment. Understanding ceiling limits is crucial for safety regulations and for protecting workers who might be exposed to hazardous atmospheres. Such limits are established based on toxicological data and the potential health effects of exposure.