| Acronym | Meaning |
 | OEH | One-electron Hamiltonian (quantum Method) |
| PSNS | Pretreatment Standards For New Sources |
| FWPCA | Federal Water Pollution Control Administration |
| CLIM | Climate Change Database (accessible Through OLS) |
| MUCT | Multiphase Unsaturated Zone Contaminant Transport Model |
| FPEIS | Fine Particulate Emissions Information System |
| NBOD | Nitrogenous Biochemical Oxygen Demand |
| ARB | Air Resources Board (California) |
| SRD | Standard Reference Data |
| ZOAO | Zero Overlap Of Atomic Orbital Approxn. |
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