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The National Atmospheric Emissions Inventory is the official air emissions inventory for the UK. The program is funded by DETR and the inventory is compiled by the National Environmental Technology Centre at AEA Technology Environment. Emissions are estimated for significant UK air pollutants based on national statistics. Most pollutant estimates cover the period 1970 to the latest year (currently 1997). 1x1km emission maps are compiled using national and regional datasets. These maps include part 'A' process emissions and major road link data and are provided as a first step to assessing local area emissions.