| Acronym | Meaning |
 | GCOS | Global Climate Observing System (WMO |
| RI | Replication Index |
| SMAI | Solvated Metal Atom Impregnation |
| TEDS | Timed Exposure Diffusive Sampler (for Air Pollution) |
| GMAW | Gas Metal Arc Welding |
| LII | Liquid Injection Incinerator |
| HOPC | High Osmotic Pressure Chromatography |
| SERDP | Strategic Environmental Research And Development Program |
| IPA | Independent-pair Approximation |
| RXES | Resonant X-ray Emission Spectra |
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