Lethal Concentration Low. The lowest concentration of a substance in air, other then LC50, which as been reported to have caused death in human or animals. The reported concentrations may be entered for periods of exposure that are less than 24 hours (acute) or greater than 24 hours (subacute and chronic).

Lethal concentration, low. The lowest concentration to cause death in test animals.

Lethal concentration low. Lowest airborne concentration reported to cause death in humans or animals. Acute exposures are 24 hours while chronic exposures are 24 hours.

Low Context Learning Object. A Low Context Learning Object (LCLO) is a digital resource that supports teachers and students in the presentation and understanding of learning outcomes. Because of the necessity for a high degree of teacher guidance, an LCLO does not provide sufficient background information for students who are working independently; instead, it is designed to enhance the presentation of information through exploration, illustration, review, or discussion of specific contexts. Teachers will therefore play a crucial role in the function of LCLOs by providing students with any context or supplementary background that is relevant to the learning outcome(s). Given their open-ended design, LCLOs are extremely flexible multimedia resources, as they can be used in a variety of classroom environments and subject areas.