Digital Scent technology has witnessed exponential development from its initial deployment by the US Army in the Vietnam war to massive e-nose networks setup, around the world, presently. The digital scent technology has gained momentum recently with the development of emerging technologies like artificial intelligence and IoT. E-nose technology has seen widespread adoption in the waste management industry. Countries, such as the Netherland, UAE, Kuwait, and Italy have the most comprehensive e-nose networks. Countries like South Africa, Oman, and Estonia, have also invested in developing such e-nose networks. Odor pollution has become a sensitive issue in many parts of the world, with many severe instances reported by different countries in the world. The latest was from Malaysia in July 2019, when the authorities in Malaysia had to dispatch several teams to comb Batang Kali, which was considered to be the source of foul smell which spread through the region.

The proliferation of handheld devices has led to developments in the field of gas sensors, detector, and analyzer, which has considerably widened the scope of application across multiple end-user segments. Due to their chemical composition and properties, metal oxide gas sensors are well-suited for a wide range of applications, including the detection of all reactive gases. Depending on the material used and the gases that need to be detected, typical operating temperatures range between 300°C and 900°C. Currently, some of the prominent companies are developing products across the detector, as well as the analyzer segment having application across clinical assaying, environmental emission control, explosive detection, agricultural storage, and shipping, along with workplace hazard monitoring.