| Acronym | Meaning |
 | IST | Internal Standardization Technique |
| TED | Thermal Electron Detectors |
| TIC | Total Ion Current |
| IA | Impulse Approximation |
| T-GAS | Trace Gas Accounting System |
| ELSA | Emergency Level Scale Assessment |
| UNO | Unrestricted Natural Orbital |
| TOM | Total Organic Matter |
| SVE | Selected Valence Electron Model |
| IEQ | Indoor Environmental Quality |
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