CO2 regional emissions are imputed from national emission data allocated to grids of circa 10 km x 10 km square. It includes emissions from all sources with the exception of air transport, international aviation and shipping.
Regions in OECD Member Countries have been classified according to two territorial levels (TL). The higher level (Territorial Level 2) consists of about 362 macro-regions while the lower level (Territorial Level 3) is composed of 1794 micro-regions.This classification - which, for European countries, is largely consistent with the Eurostat classification - facilitates greater comparability of regions at the same territorial level. The differences with the Eurostat NUTS classification concern Belgium, Greece and the Netherlands where the NUTS 2 level correspond to the OECD TL3 and Germany where the NUTS1 corresponds to the OECD TL2 and the OECD TL3 corresponds to 97 spatial planning regions (Groups of Kreise). For the United Kingdom the Eurostat NUTS1 corresponds to the OECD TL2. An OECD metropolitan region typically consists of a core area with significant concentration of employment or population and a surrounding area densely populated and closely tied with the core. There are currently 90 metropolitan regions in the OECD, which are the aggregation of TL3 regions based on population density, size and commuting criteria.
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