Ceiling Exposure Level Mean?
The ceiling exposure value (CEV) refers to the maximum concentration of an airborne substance – either biological or chemical – that should never be exceeded under any circumstance. It is the maximum concentration to which a worker may be exposed at any time. This means that a worker who is exposed to a concentration higher than the CEV may suffer health effects, regardless of the duration of exposure. This exposure limit is strictly observed for chemicals and biological agents that could cause irreversible health effects. It should never be exceeded.
Safeopedia Explains Ceiling Exposure Level
The ceiling exposure value is set by various regulatory bodies. They are set for the most commonly used industrial chemicals and are usually based on the dangers associated with inhalation. The fact that there does not appear to be a set ceiling exposure value for a substance should not be interpreted to mean that there is no danger associated with the substance. Exposure levels may differ for the same substance as they may be set by different regulatory bodies.