| Bq | Becquerel |
| C | Celsius |
| Ci | curie |
| CC14 | carbon tetrachloride |
| cm | centimeters |
| CFC | chlorofluorocarbons |
| CO | carbon monoxide |
| dB | decibel |
| dBA | decibel A-weighted |
| DCE | 1, 2-dichloroethylene |
| F | Fahrenheit |
| ft | feet |
| ft2 | square feet |
| ft3 | cubic feet |
| ft3/s | cubic feet per second |
| g | grams |
| gal | gallons |
| GPD | gallons per day |
| gpm | gallons per minute |
| GPY | gallons per year |
| ha | hectares |
| hr | hour |
| in | inches |
| kg | kilograms |
| km | kilometers |
| kV | kilovolts |
| kVA | kilovolt-ampere |
| kW | kilowatts |
| kWh | kilowatt hours |
| L | liters |
| lb | pounds |
| Li | lithium |
| m | meters |
| m2 | square meters |
| m3 | cubic meters |
| m3/s | cubic meters per second |
| mCi | millicurie (one-thousandth of a curie) |
| mCi/ml | millicurie per milliliter |
| mg | milligram (one-thousandth of a gram) |
| mg/L | milligrams per liter |
| MGY | million gallons per year |
| mi | miles |
| MLY | million liters per year |
| mph | miles per hour |
| mrem | millirem (one-thousandth of a rem) |
| MVA | megavolt-ampere |
| MW | megawatt |
| MWe | megawatt electric |
| MWh | megawatt hour |
| MWt | megawatt thermal |
| nCi | nanocurie (one-billionth of a curie) |
| nCi/g | nanocuries per gram |
| NO2 | nitrogen dioxide |
| NOX | nitrogen oxides |
| O3 | ozone |
| Pb | lead |
| PCB | polychlorinated biphenyl |
| pCi | picocurie (one-trillionth of a curie) |
| pCi/l | picocuries per liter |
| PM10 | particulate matter (less than 10 microns in diameter) |
| ppb | parts per billion |
| ppm | parts per million |
| rem | roentgen equivalent man |
| SO2 | sulfur dioxide |
| t | metric tons |
| TATB | triaminotrinitrobenzene |
| TCA | 1, 1, 1-trichloroethane |
| TCE | trichloroethylene |
| TNT | trinitrotoluene |
| yd3 | cubic yards |
| yr | year |
| µCi | microcurie (one-millionth of a curie) |
| µCi/g | microcuries per gram |
| µg | microgram (one-millionth of a gram) |
| µg/kg | micrograms per kilogram |
| µg/L | micrograms per liter |
| µg/m3 | micrograms per cubic meter |
| µ | micron or micrometer (one-millionth of a meter) |