This paper analyses the greenhouse gas emissions from private transport in the Brussels-Capital region. A system of models integrating urban development, mobility and air pollution is proposed. We consider the 2005 perspective, comparing 'business-as-usual', 'polycentric' and 'peripheral' scenarios of urban development and mobility in the city. Analysis with a focus on several important areas inside Brussels was performed to identify possible solutions and measures to integrate land-use with mobility in order to reduce air pollution.