ADMS-Screen is a screening model for air quality calculations. It models dispersion from a single stack to calculate ground-level concentrations, providing rapid assessments of stack height. Comparison with air quality strategy objectives and European Union air quality standards can be made. The model also has an option to include building effects. It can be used to indicate whether further modelling is required.
http://www.cerc.co.uk/environmental-software/ADMS-Screen-model.html