| Acronym | Meaning |
 | NSO | Natural Spin Orbitals |
| TDM | Truncated Diagonalization Method |
| QUAL2E | Enhanced Stream Water Quality Model |
| PIMA | Polyisocyanurate Insulation Manufacturers Association |
| UATMP | Urban Air Toxics Monitoring Program |
| CCSC | Charge And Configuration Self-consistency |
| CRE | CAMP-responsive Element |
| SHE | Standard Hydrogen Electrode |
| NEDB | National Exposure Database (HSE) |
| PIN | Pesticide Information Network |
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