driven by a National Air Quality Strategy which requires local government authorities e.g. towns and districts, to
manage air quality in their areas, with the aim of achieving the objectives laid out in Table 1. As the first step towards
implementing the strategy, 14 authorities were designated as pilot areas and were required to undertake combinations of modelling and monitoring work.
The 14 pilot authorities chosen varied in extent and in emission characteristics. The three that are described in this
paper, London, Neath/Port Talbot and Swansea, and Belfast are each described briefly in section 3.
ADMS-Urban  was used in conjunction with local emissions inventories to model concentrations of the key pollutants in each area over periods of up to 6 months. Predicted concentrations include time series at locations coincident with monitors and contour maps over the total calculation area.
Section 2 describes briefly the main features of ADMS-Urban. After the description of the pilot areas in section 3 the
results of the studies are presented and discussed in sections 4 and 5.