The series of Indoor Air and Climate conferences started in August 1978 in Denmark. At the 11th congress in 2008 we will celebrate the 30 year anniversary of the inaugural conference by revisiting Copenhagen. The 11th Indoor Air conference will be a multidisciplinary event involving participants from medicine, engineering, architecture and related fields. The conference will cover all aspects of Indoor Air Quality and Climate and the effects on human health, comfort and productivity. Cutting-edge research results will be presented, including ways to achieve an optimal indoor environment in a sustainable manner. The conference will address a variety of indoor environments - residential, office, school, industrial, commercial and transport.