ADMS-Urban pollution model is a comprehensive tool for tackling air pollution problems in cities and towns. It can be used to examine emissions from 6000 sources simultaneously.
ADMS-Urban is used to model the impact of major developments such as the Beijing Olympic Village, airport expansion and traffic management schemes. It is used to assess current and future air quality with respect to the air quality standards such as the EU Air Quality Directive, UK NAQS, US NAAQS, Chinese Class I, II and III and WHO guidelines.
http://www.cerc.co.uk/environmental-software/ADMS-Urban-model.html