| Acronym | Meaning |
| HDL | High Density Lipoprotein |
| AREELS | Angle-resolved Electron Energy Loss Spectroscopy |
| TWA | Time-weighted Average Limit |
| UNITAR | United Nations Institute For Training And Research |
| NWEA | National Wood Energy Association |
| SGA | Symmetric Group Approach |
| CAWG | Clean Air Working Group |
| ACP | Approximate Coupled-pair (method For Correlation-energy Calcn.) |
| HASP | Harmonically Analyzed Sensitivity Profile |
| CEDAR | Coupling, Energetics, And Dynamics Of Atm. Regions [project] |