| Glossary: | |
Acid Neutralising Capacity (ANC) | Ability of a solution to neutralise inputs of strong acid to a preselected equivalence. An important chemical parameter used in critical load calculations. |
Acidification | Acidification is caused by anthropogenic input of acidifying compounds, manly sulphur and nitrogen compounds, into an ecosystem in excess of its ability to buffer the acidifying effects. |
Base Cations | Sum of calcium, magnesium, sodium and potassium cations. |
CCC | Chemical Coordinating Centre |
CCE | Coordination Centre for Effects |
CIAM | Centre for Integrated Assessment Modelling |
Critical Levels | Concentrations of pollutants in the atmosphere above which direct adverse effects on receptors, such as human beings, plants, ecosystem or materials may occur, according to present knowledge. |
Critical Load | A quantitative estimate of an exposure to one or more pollutants below which significant harmful effects on specified sensitive elements of the environment do not occur, according to present knowledge. |
| EGPM | Expert Group on Particulate Matter |
| EGTEI | Expert Group on Techno- Economics Issues |
EMEP | European Monitoring and Evaluation Programme: a scientifically based and policy driven programme under the Convention on Long-range Transboundary Air Pollution for international co-operation to solve transboundary air pollution problems. |
EMEP-SB | Steering Body of EMEP |
Emission | The release of a substance from a point or diffuse source of a human activity (e.g. energy generation, industry, transport, agriculture) into the atmosphere. |
Eutrophication | Eutrophication is caused by anthropogenic input of nitrogen compounds causing an excessive supply of nutrients to an ecosystem resulting in adverse effects, such as algal blooms in aquatic ecosystems and shifts in the diversity of plant species of terrestrial ecosystems. |
Ground-Level Ozone | Secondary ozone pollution, formed through photochemical processes in the atmosphere at the presence of nitrogen oxides, volatile organic compounds and sunlight. |
ICP | International Cooperative Programme. There are ICPs on Forests (F), Integrated Monitoring (IM), Materials (M), Vegetation (V), Waters (W) and Modelling and Mapping (M&M) |
| JEG | Joint Expert Group on Dynamic Modelling |
| LRTAP | Long-range Transboundary Air Pollution |
MRC | Main Research Centre |
MSC-E | Meteorological Synthesizing Centre � East |
MSC-W | Meteorological Synthesizing Centre � West |
| NEBEI | Network of Experts on Benefits and Economic Instruments |
| NFC | National Focal Centre of the ICP M&M |
| NFP | National Focal Points of an International Cooperative Programme |
Oxidised nitrogen compounds | Are nitrogen oxide and nitrogen dioxide, expressed as NOx |
Receptors | An ecosystem, or part of an ecosystem of interest that is potentially impacted by concentrations or depositions of atmospheric pollutants. Receptors under the Convention include aquatic and terrestrial ecosystems as well as materials such as cultural heritage. |
Reduced nitrogen compounds | Means ammonia and its reaction products. |
SSMB (SMB) | Steady-State Mass Balance model (Simple Mass Balance model |
TF | Task Force |
TFEIP | Task Force on Emission Inventories and Projections |
TFIAM | Task Force on Integrated Assessment Modelling |
TFMM | Task Force on Measurement and Modelling |
| TF M&M | Task Force on the modelling and mapping of critical levels & loads, air pollution effects, risks and trends |
| TFHTAP | Task Force on Hemispheric Transport of Air Pollution |
| TFRN | Task Force on Reactive Nitrogen |
| TFPOP | Task Force on Persistent Organic Pollutants |
| TFH | Task Force on Health |
UNECE | United Nations Economic Commission for Europe |
Volatile organic compounds (VOCs) | Are all organic compounds of an anthropogenic nature, other than methane, that are capable of producing photochemical oxidants by reaction with nitrogen oxides in the presence of sunlight. |
WGE | Working Group on Effects |
WGSR | Working Group on Strategies and Review |
