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

NIOSH National Institute for Occupational Safety and Health

NO nitric oxide

NO2 nitrogen dioxide

N2O4 nitrogen tetroxide

NOAEL no-observed-adverse-effect level

NOEL no-observed-effect level

NRC National Research Council

OSHA Occupational Health and Safety Administration

PBPK physiologically based pharmacokinetic

PD phenyldichloroarsine

POD point of departure

ppm part per million

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

REL recommended exposure limit (NIOSH)

SMAC spacecraft maximum allowable concentration

SO3 sulfur trioxide

SOP standing operating procedures

STEL short-term exposure limit

TMB trimethylbenzene

TLV Threshold Limit Value

TRI Toxics Release Inventory

TSD technical support document

UF uncertainty factor

WEEL workplace environmental exposure limit

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