The 9th Highway and Urban Environment Symposium (9HUES) was held in Madrid, Spain, from 9-11 June 2008. HUES is run by Chalmers University of Technology within the Alliance for Global Sustainability (The AGS). HUES was initiated by Professor Ron Hamilton at Middlesex Polytechnic (now University) in the early 1980s and had the title "Highway Pollution." The initial aim was to measure and assess challenges in highway pollution, with a strong emphasis on urban photochemical smog, ozone formation and particle release. After the first symposium, the emphasis on air pollution issues continued through to Munich in 1989 where diesel particulate issues and the relevance to health through measurements of PM10 emerged. The focus on air quality issues was also strengthened. In parallel, the symposium started to receive an increasing number of scientific contributions from the area of urban run off, indeed to the extent that the title of the symposium was changed to "Highway and Urban Pollution." Since then the importance of science in support of policy became increasingly important as a key aspect of the symposium. 9HUES was held at TRANSyT- Universidad Politecnica de Madrid, Spain to provide a professional and scientific forum on global examples of the science required to support pathways to a positive and sustainable future in the highway and urban environment. This volume contains papers grouped by topic on ustainable mobility and management; air pollution; trace elements in the environment; urban water contamination, contaminated sites and treatment; urban climate and climate change. "

With half of the world s population now living in urban areas, and rapid urbanization continuing apace, it is essential that the growth of urban areas is supported by the development of adequate and sustainable infrastructure. This work offers comprehensive coverage of critical issues on the highway and urban environment which are key to understanding sustainability in the world's expanding urban areas."

The 9th Highway and Urban Environment Symposium (9HUES) was held in Madrid, Spain, from 9-11 June 2008. HUES is run by Chalmers University of Technology within the Alliance for Global Sustainability (The AGS). HUES was initiated by Professor Ron Hamilton at Middlesex Polytechnic (now University) in the early 1980s and had the title "Highway Pollution." The initial aim was to measure and assess challenges in highway pollution, with a strong emphasis on urban photochemical smog, ozone formation and particle release. After the first symposium, the emphasis on air pollution issues continued through to Munich in 1989 where diesel particulate issues and the relevance to health through measurements of PM10 emerged. The focus on air quality issues was also strengthened. In parallel, the symposium started to receive an increasing number of scientific contributions from the area of urban run off, indeed to the extent that the title of the symposium was changed to "Highway and Urban Pollution." Since then the importance of science in support of policy became increasingly important as a key aspect of the symposium. 9HUES was held at TRANSyT- Universidad Politecnica de Madrid, Spain to provide a professional and scientific forum on global examples of the science required to support pathways to a positive and sustainable future in the highway and urban environment."

Today, half of the world's population lives in urban areas and the rapid urbanization we are seeing is expected to continue in the next decades.The growth of urban areas around the world presents many challenges and needs to be supported by the development of adequate and sustainable infrastructures.This work offers comprehensive coverage of critical issues on the highway and urban environment which are key to understanding sustainability in the world's expanding urban areas.It offers a highly relevant round-up of the proceeding of the Highway and Urban Environment Symposium held in Nicosia, Cyprus, last year.