| NG/ML |
Nanogram per milliliter |
| NG/SAMPLE |
Nanograms per sample |
| NGE2/L |
Nanogram per liter 17-beta-estradiol equivalency agonist |
| NGTCDD/L |
Nanogram per liter TCDD equivalency agonist |
| NL/L |
Nanoliters per liter |
| NM |
Nanomolar |
| NMOL/G |
Nanomoles per gram |
| NMOL/L |
Nanomoles per liter |
| NONE |
No unit of measure |
| NTMU |
Nephelometric Turbidity Multi Units |
| NTRU |
Nephelometric Turbidity Ratio Units |
| NTU |
Nephelometric Turbidity Units |
| OHM |
Ohm |
| OHMCM |
Ohm-centimeter |
| OZ |
Ounces |
| P/A |
Presence/Absence (Present = 1, Absent = 0) |
| PA |
Pascal |
| PASS/FAIL |
Pass/Fail (Pass = 1, Fail = 0) |
| PCF |
Pounds per cubic foot |
| PCI/G |
PicoCuries per gram |
| PCI/L |
PicoCuries per liter |
| PCI/L/30D |
PicoCuries per liter per 30 Day |
| PCI/L/72HR |
PicoCuries per liter per 72 hour |
| PER LOSS |
Percent loss |
| PER WGT |
Percent by weight |
| PERCENT |
Percent |
| PEREFF |
Percent Effect |
| PERMIL |
Permil |
| PERMOD |
Percent Modern |
| PERPASS |
Percent Passing |
| PERSAT |
Percent Saturation |
| PERSUR |
Percent Survival |
| PFU/100ML |
Plaque-Forming Unit per 100 milliliters |
| PG |
Picogram |
| PG/G |
Picogram per gram |
| PG/KG |
Picograms per kilogram |
| PG/L |
Picogram per liter |
| PH UNITS |
pH units |
| PPB |
Parts per billion |
| PPBV |
Parts per billion by volume |
| PPM |
Parts per million |
| PPMB |
Parts per million, benzene equivalent (for soil/gas) |
| PPMC |
Parts per million carbon |
| PPMCACO3 |
Parts per million as CaCO3 |
| PPMM |
Parts per million, methane equivalent (for soil/gas) |
| PPMV |
Parts per million by volume |
| PPQ |
Parts per quadrillion |
| PPT |
Parts per trillion |
| PPTH |
Parts per thousand |
| PPTV |
Parts per trillion by volume |
| PRSABS/L |
Presence or Absence per Liter |
| PSF |
Pounds per square foot |
| PSI |
Pounds per square inch |
| PSU |
Practical Salinity Unit |
| S |
Second |
| SAL |
Salinity Units |
| SDSIU |
Stiff Davis Stability Index Units |
| T.O.N. |
Threshold Odor Number |
| T/DAY |
Metric tons per day |
| T/F |
True/False (True = 1, False = 0) |
| TCACO3/KT |
Tons of CaCO3 per kiloton |
| TONS/DAY |
Tons per day |
| TONS/YEAR |
Tons per year |
| TUA |
Acute Toxicity Units |
| TUC |
Chronic Toxicity Units |
| UG |
Micrograms |
| UG/100CM2 |
Micrograms per 100 square centimeters |
| UG/CM2 |
Micrograms per centimeter squared |
| UG/DAY |
Micrograms per day |
| UG/G |
Micrograms per gram |
| UG/KG |
Micrograms per kilogram |
| UG/L |
Micrograms per liter |
| UG/M3 |
Micrograms per cubic meter |
| UG/MG |
Micrograms per milligram |
| UG/ML |
Micrograms per milliliter |
| UG/SAMPLE |
Micrograms per total air sample taken |
| UG/UL |
Micrograms per microliter |
| UG/WIPE |
Micrograms per wipe |
| UG/YR |
Micrograms per year |
| UGCACO3/L |
Micrograms of calcium carbonate per liter |
| UL |
Microliter |
| UL/L |
Microliter per liter |
| ULBS/DAY |
Micro pounds/day |
| UMHOS |
Micromhos |
| UMHOS/CM |
Micromhos (UMHOS) per centimeter |
| UMOLES/G |
Micromoles per gram |
| UMOLES/L |
Micromoles per liter |
| UP/DOWN |
Up/Down (Up = 1, Down = -1) |
| UPY |
Units per year |
| US/CM |
Microsiemens per centimeter |
| US/M |
Microsiemens per meter |
| YRS |
Years |