| Acronym | Meaning |
| RFIE | Reverse Flow Ion Exchange |
| SDC | Samaria-doped Ceria |
| CSD | Charge State Distribution |
| FEL | Fixed Emission Limit |
| TEM | Transmission Electron Microscopy |
| ILAP | Inter-Laboratory Analysis Program |
| NVFEL | National Vehicle And Fuel Emissions Laboratory |
| SA-CAS-SCF | State-averaged-complete Active Space-SCF |
| DEXA | Dual Energy X-ray Absorptiometry |
| HERAC | Health And Environmental Research Advisory Committee |