The book contains the invited papers held at the EUROTOX 1993 congress in Uppsala, Sweden. It provides up-to-date information on recent developments in toxicology. Special emphasis is put on the area of risk assessment where more mechanistic input from basic toxicology is needed. The book also includes a series of papers on the recent status of pollution of the Baltic Sea. Research on Baltic Sea ecotoxicology is an internationalt commitment ofthe countries of this area. Due to the political development of the pastfew years, combined efforts and programs in this field will be possible.