| Acronym | Meaning |
| ETD | Enhanced Trickle Down (watershed Acidification Model) |
| CIOSA | Classical Infinite-order Sudden Approxn. |
| TCR | Total Chlorine Residual |
| EPDM | Ethylene-propylene Diene Monomer |
| NOI | Notice Of Intent |
| EBS | Electron Backscattering |
| UCG | Underground Coal Gasification |
| ARRP | Ammonia Removal And Recovery Process |
| BFB | Bubbling Fluidized Bed |
| ERCAM | Emission Reduction And Cost Analysis Model |