- Acid deposition
A phenomenon whereby acidic atmospheric pollutants are deposited on earth.
- Acid rain
See acid deposition
A suspension of nanoscopic airborne solid or liquid particles that reside in the atmosphere for at least several hours.
- Air capture
The direct capture of CO2 and other GHGs from the atmosphere.
The fraction of solar radiation reflected by a surface or object.
- Anthropogenic emissions
Emissions of greenhouse gases (GHGs), precursors of GHGs and aerosols caused by human activities.
- Anthropogenic removals
The withdrawal of GHGs from the atmosphere as a result of deliberate human activities.
The gaseous envelope surrounding the Earth.
- Black carbon (BC)
Operationally defined aerosol type based on measurement of light absorption and chemical reactivity and/or thermal stability; soot.
- Clean Sky Joint Undertaking (CSJU)
A joint initiative established by the European Commission and the European aviation industry to research and develop technologies that reduce GHG emissions and other forms of pollution in the aviation industry.
- Convention on Long-Range Transboundary Air Pollution , 1979 (LRTAP)
A regional framework applicable to Europe, North America and Russia and former East Bloc countries, for reducing transboundary air pollution.
The amount of energy consumed in direct and indirect transformations to make a product or service.
Pollution discharged into the atmosphere from residential chimneys, smokestacks, other vents and surface areas of commercial or industrial facilities and from motor vehicle, locomotive, or aircraft exhausts.
- Emission factor
The relationship between the amount of pollution produced and the amount of raw material processed.
- Emission intensity
The rate of pollutant emissions per unit of economic activity.
- Emission pathway
- Emission Reduction Target
An emission reduction objective that entities aim to reach within a given time frame.
- Emission Reduction Unit (ERU)
A Kyoto Protocol unit equal to 1 metric tonne of CO2 equivalent.
- Emission scenario
A plausible representation of the future development of emissions of substances that are radiatively active, based on a coherent and internally consistent set of assumptions about driving forces and their key relationships.
- Emission standard
A standard that sets a limit on the quantity of pollutants and GHGs that can be emitted into the atmosphere from a specific source or group of sources.