min minute

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

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

PHA phytohemagglutinin

PMN polymorphonuclear leukocyte

ppm parts per million

RBC red blood cell

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

RFNA red fuming nitric acid

SAR structure-activity relationship

SOP standard operating procedure

STEL short-term exposure limit

STV short-term value

TLV Threshold Limit Value

TSD technical support document

UF uncertainty factor

URL uniform resource locator for the Internet

WEEL workplace environmental exposure limit

WFNA white fuming nitric acid

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