Recent developments in air pollution modeling are explored as a series of contributions from researchers at the forefront of their field. This book on air quality modelings and its applications is focussed on local, urban, regional and intercontinental modeling, data assimilation and air quality forecasting, model assessment and validation, aerosol transformation, the relationship between air quality and human health and the effects of climate change on air quality. It consists of a series of papers that were presented at the 28th NATO/CCMS Conference on Air Pollution Modeling and its Application held in Leipzig, Germany, May 15-19, 2006. It is intended as reference material for students and professors interested in air pollution modeling at the graduate level as well as researchers and professionals involved in developing and utilizing air pollution models. *Discusses cutting-edge developments on air pollution modeling and air quality issues *Presents topical and highly relevant subjects to the air quality and modeling research community *Provides material that can be used to further improve air quality modeling and to inform the community about recent and novel developments in the field.