| Acronym | Meaning |
| AIR CHIEF | Air ClearingHouse For Inventories And Emission Factorspar |
| SASU | Source Apportionment |
| AER | Atmospheric And Environmental Research |
| SOC | Superposition Of Configurations (wave Functions) |
| ETIC | Environmental Teratology Information Center |
| IPA | Independent-particle Approximation (in Quantum Calcns. On Solids) |
| MICROSS | Micro-computer Based River Oil Spill Simulation |
| TTP | Thrombotic Thrombocytopenic Purpura |
| AU | Absorbance Units |
| ERAD | Economic And Regulatory Analysis Division (OPPE) |