| AS | Shareholder Company (aktsiaselts) |
| BAT | Best Available Technologies |
| BATNEEC | Best Available Technologies Not Entailing Excessive Costs |
| BOD | Biological Oxygen Demand |
| CEDs | County Environmental Departments |
| CO2 | Carbon Dioxide |
| EEK | Estonian Kroon (currency) |
| EBRD | European Bank for Reconstruction and Development |
| EIA | Environmental Impact Assessment |
| EMS | Environmental Management System |
| EMAS | Eco-Management and Audit Scheme |
| ESA | Statistical Office of Estonia |
| EU | European Union |
| IPPC | Integrated Pollution Prevention and Control |
| ISO | International Standards Organization |
| GDP | Gross Domestic Product |
| GW/h | Gigawatt per hour |
| HELCOM | Helsinki Commission |
| LG | Local Government |
| MoE | Ministry of Environment |
| NEAP | National Environmental Action Plan |
| NES | National Environmental Strategy |
| NGO | Nongovernmental organization |
| NOX | Nitrogen Oxides |
| OECD | Organization for Economic Cooperation and Development |
| SG | State Gazette (Riigi Teataja - official publication of legal acts) |
| SO2 | Sulphur Dioxide |
| UNFCCC | United Nations Framework Convention on Climate Change |
| USD | U.S. Dollar |
| WB | The World Bank |
| WEC | World Environment Center |
| CO | Carbon Monoxide |
| EC | European Commission |
| EMAS | Eco-Management and Audit Scheme |
| EPA | Environmental Protection Agency (Danish) |
| EU | European Union |
| GDP | Gross Domestic Product |
| IFI | International Financing Institution |
| ISO 14000 | International Standards Organization 14000 Program |
| LEIF | Latvian Environmental Investment Fund |
| LVL | Latvian Lats (currency) |
| MoE | Ministry of Environmental Protection and Regional Development |
| NEAP | National Environmental Action Plan |
| NEFCO | Nordic Environment Finance Corporation |
| NEPP | National Environmental Policy Plan |
| NGO | Nongovernmental organization |
| NOX | Nitrogen Oxides |
| SO2 | Sulphur Dioxide |
| U.N. | United Nations |
| USD | U.S. Dollar |
| VAT | Value-Added Tax |
| R&D | Research and Development |
| LEIF | Lithuanian Environmental Investment Fund |
| EBRD | European Bank for Reconstruction and Development |
| MoEP | Ministry of Environmental Protection |
| MAP | Maximum Allowed Pollution |
| HPC | Highest Permissible Concentrations |
| kV | Kilovolt |
| MW | Megawatt |
| USAID | United States Agency for International Development |
| WEC | World Environment Center |
| REC | Regional Environmental Center for Central and Eastern Europe |