The symposium is designed for an international audience of clinicians and inhalation scientists from government, industry and academia. Ten very well attended and successful symposia on the subject of inhalation toxicology were already held in Hannover in 1987, 1989, 1991, 1993, 1995, 1997, 1999, 2001, 2003, and 2006. Titles of these symposia were: