In recent years, many attempts were made by the researchers on the development of various types of the gas sensors, including metal oxide, metal oxide semiconductors, IR sensors, electrochemical sensors etc. These sensors have some issues such as they needs to operate at higher temperatures, are incompatible with measuring system, lack of sensitivity and selectivity. These issues can be resolved by using a new class of sensor called as 'Surface Acoustic Wave (SAW) sensor'. These sensors offer high sensitivity, selectivity, robustness and ready to operate at room temperature. So, in the present work, development of SAW delay line sensor along with polyaniline nanocmoposite material as a sensing material for ammonia and VOCs detection has been done. The work have been carried out in different steps: Synthesis of sensing material, Sensor development, testing of sensing layer performance using SAW device for ammonia and VOCs, result analysis and conclusion.