A device is developed to detect ammonium in the environment. A micro electromechanical systems (MEMS), lab-on-a-chip (LOC) sensor will be integrated into a quad-rotor micro air vehicle (MICAV) to detect ammonium, which is commonly used in explosives, in the atmosphere. The sensor was developed in India by Anna University Foundation for Educational Excellence in collaboration with Concord University, Canada.

The LOC weighs just about 200 grams and has been developed specifically for airborne application.  The quad-rotor MICAV was chosen over the conventional fixed wing MICAVs as they can easily enter inaccessible areas.  Apart from this sensor chip to detect ammonium, National Design and Research Forum (NDRF) has also developed sensors to detect methane, carbon-dioxide and nitric oxides.