This book contains updated results of both theoretical and applied research in the field of sensors and methods for environmental control, mainly with regard to the detection of pollutant species in gaseous and liquid ambients.The main arguments are related to: development of new nanostructured materials as sensing layers and new detection mechanisms; development of micro- and nano-systems and their integration in miniaturised instruments; application of innovative devices in the detection of contaminant chemical species and their monitoring.The proceedings have been selected for coverage in:• Index to Scientific & Technical Proceedings (ISTP CDROM version / ISI Proceedings)