Gas sensors are simultaneously an established and emerging industry, creating a complex web of technologies and applications for stakeholders to understand. Detection methods span a diverse technology landscape, ranging from semiconductor and optical to acoustic and photoionization.

Smartwatches have soared in popularity in recent years, with their motion and heart rate sensors tracking the activity of millions worldwide. However, not all activity can be monitored using step counts - limiting the appeal of existing wearable technology to many gym-goers and amateur athletes.