LC50 concentration of a substance that is lethal to 50% of test organisms in a given time

LD50 dose of a substance that is lethal to 50% of test organisms in a given time

LOA level of distinct odor awareness

LOAEL lowest-observed-adverse-effect level

MAC maximaal aanvaarde concentratie (maximum accepted concentration)

MAK maximale argeitsplatzkonzentration (maximum workplace concentration)

min minute

NAC National Advisory Committee on Acute Exposure Guideline Levels for Hazardous Substances

NIOSH National Institute for Occupational Safety and Health

NO2 nitrogen dioxide

NOAEL no-observed-adverse-effect level

NOEL no-observed-effect level

NRC National Research Council

NTP National Toxicology Program

ORNL Oak Ridge National Laboratory

PBPK physiologically based pharmacokinetic

POD point of departure

ppm parts per million

RBC red blood cell

RD50 concentration of a substance that reduced the respiratory rate of test organisms by 50%

REL reference exposure level

SO2 sulfur dioxide

SeF6 selenium hexafluoride

SeO selenium oxide

SFEMG Single Fiber Electromyography

SOP standard operating procedure

STEL short-term exposure limit

TLV Threshold Limit Value

TMB trimethylbenzene

TPA 12-O-tetra-decanoly-phorbol-13-acetate

TSD technical support document

UF uncertainty factor

WEEL workplace environmental exposure limit

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