| Abbreviation | Definition |
|---|---|
| ASWP | Air/Soil/Water Pollution |
| ASWR | Army Solid Waste and Recycling |
| ASWT | Alkaline Subcritical Water Treatment |
| AT | Appalachian Trail |
| ATCP | Air Toxics Control Plan |
| ATM | Advaced Treatment Method |
| ATR | Advanced Technology Recycling |
| ATRS | American Textile Recycling Service |
| ATRS | American Textile Recycling Services |
| ATWE | Aerobically Treated Wastewater Effluent |
| ATWE | Alpine Treeline Warming Experiment |
| AUSA | Affinity Ultrafiltration Separation Assay |
| AVO | Aanvullend Voorzieningengebruik Onderzoek |
| AVRDC | Asian Vegetable Research and Development Center |
| AWCA | Alaska Wildlife Conservation Association |
| AWCC | Alberta Watercourse Crossing Committee |
| AWCC | Area Wide Compaction Control |
| AWCP | Agricultural Water Conservation Program |
| AWCP | Aquatic Weed Control Program |
| AWCP | Arkansas Wetlands Conservation Plan |