This report is part of the development of a National Modelling System for local air quality (the “Nasjonalt Beregningsverktøy” or NBV project). The work focussed on the methods to estimate emissions and identified the main information sources of the needed input data for emissions. This report presents the most common methods to determine emissions and includes recommendations for future improvement of the emission calculations. The main purpose of the report is to identify the most relevant sources of emission information and the emission input data requirements necessary for modelling air quality in Norwegian cities and agglomerations
