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An emission inventory is an accounting of the amount of pollutants discharged into the atmosphere. An emission inventory usually contains the total emissions for one or more specific greenhouse gases or air pollutants, originating from all source categories in a certain geographical area and within a specified time span, usually a specific year. An emission inventory is generally characterized by the following aspects: *Why: The types of activities that cause emissions, *What: The chemical or physical identity of the pollutants included, *Where: The geographic area covered, *When: The time period over which emissions are estimated, *How: The methodology to use. Emission inventories are compiled for both scientific applications and for use in policy processes. == Use == Emissions and releases to the environment are the starting point of every environmental pollution problem. Information on emissions therefore is an absolute requirement in understanding environmental problems and in monitoring progress towards solving these. Emission inventories provide this type of information. Emission inventories are developed for a variety of purposes: *Policy use: by policy makers to * *track progress towards emission reduction targets, * *develop strategies and policies or; *Scientific use: Inventories of natural and anthropogenic emissions are used by scientists as inputs to air quality models. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Emission inventory」の詳細全文を読む スポンサード リンク
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