Page last updated : 05/07/2006

Calculating emissions into the air

Introduction
Emissions into the atmosphere are estimated by implementing a particular calculating methodology. The identification of emitting sources is based on nomenclatures relating to emitting activities (SNAP - Selected Nomenclature for Air Pollution) and fuels (NAPFUE - Nomenclature for Air Pollution of FUEls).

Reference nomenclatures (SNAP and NAPFUE)
Sources of pollutants are defined by considering combinations of several items relating respectively to activities, fuels and rubrics dedicated to further possible subdivisions dealing with various criteria such as type of process, abatement techniques, operating conditions, etc. The second and the third items are in some cases not relevant.

• SNAP (Selected Nomenclature for Air Pollution) for emitting activities
• NAPFUE (Nomenclature for Air Pollution of FUEls) for fuels

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N.B. : the version of the SNAP nomenclature is the version 1.0 of the 20 March 1998 with adaptations from CITEPA, in december 2001, 2002 and 2005, to integrate new relevant sources about particulate emissions - These additionnal SNAP codes are in italic form.
	methodologie_emissionsEN.pdf (new version soon available) snap97ajustée_fr_et_en.pdf napfue94_en.pdf
Description of the organization of the national system of the atmospheric pollutants' emissions inventories and the methodologies used in UNECE, UNFCCC, GIC, SECTEN inventories (partial version) - Download OMINEA (Organisation et Méthodes des Inventaires Nationaux des Emissions Atmosphériques en France)