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|LCLo, Lowest Lethal Concentration|
LCLo is closely related to the LC50 value which is the concentration which kills half of the test animals under controlled conditions.
Typical units for LCLo values are parts per million (ppm) of material in air, micrograms (10-6 = 0.000001 g) per liter of air and milligrams (10-3 = 0.001 g) per cubic meter of air (see volume units and mass units).
Pay close attention to the permissible exposure level (PEL) instead. This is a more realistic determination of the maximum safe exposure to a material and is usually based on the known effects of the chemical on humans rather than laboratory animals.
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