Definition - What does Ceiling Limit mean?
A ceiling limit is the concentration limit of potentially harmful substances, or its upper value to which a worker may be exposed.
Safeopedia explains Ceiling Limit
Ceiling limits, generally, are the maximum values that a person should avoid. Ceiling limits are the upper boundaries of harmful substances to which a person should not be exposed to. For example, the ceiling limit for ammonia (NH3) is 50 ppm (parts per million).