ABSTRACT
The early alarm of pollution levels and continuous monitoring of various electrical, chemical, mechanical systems and human health monitoring systems is perhaps one of the biggest assignments the scientific community needs to solve. As per the World Health Organization (WHO), over 4.2 million deaths are reported per year only due to air pollution. In this scenario, out of many material-based sensor approaches of monitoring systems, the class of metal oxides is interesting owing to their suitable characteristics. The present book chapter focuses on putting recent developments in metal oxides in a perspective. The possible target entities are reviewed on the basis of their characteristics. The main contribution of this chapter is the critical use of literature for elaboration of the properties of metal oxide matrices useful for sensing applications, the sensing mechanisms and sensor operating characteristics.
