This book record the activities of Symposium 2000, the sixth symposium of the coordinated EUREKA environmental project, EUROTRAC, and the second of its phase, EUROTRAC-2. The number of new scientific results and findings illustrates the comprehensive nature of this highly successful project. The book contains the invited lectures under the topic headings of the symposium. The poster contributions are organised according to the 12 EUROTRAC-2 subprojects plus guest contributions. These publications provide a lively snapshot of EUROTRAC-2 and a useful reference to the most recent scientific results and principal activities in this field in Europe.