Gaseous nitrogen dioxide (NO2) has been found as one of the most dangerous and wide spread global pollutants because of its capability to produce ozone, acid rain and respiratory ailments. Furthermore, due to its high reactivity with genetic material and organic solvents (i.e., forming nitrosamines), this gas is considered to be a source for cancer diseases besides affecting the human health already in tiny concentrations (ppb level). The production of NO2 can be obtained from various ubiquitous combustion processes (e.g., car engines, power plants, and cigarette smoke). However, there are still paradigmatic and unsolved problems in low-cost gas monitoring technology (e.g., driving power consumption, selectivity, and robustness). In this project, the pulsed based gas nanosensors will be developed based on the vertical GaN nanostructures in combination with the surface functionalization of self-assembled organic monolayers (SAMs) specific to NO2. Moreover, besides having wireless and Internet of Things (IoT) modules for sensor networks and energy harvesting components (e.g., based on either solar cells or piezoelectric generator), those sensors would be integrated with a portable electronic system with periodically repeated sense and reset operations in order to enable continuous gas monitoring. For the reset element, several concepts using light-emitting diodes (LEDs) and heaters will be investigated. These platforms are expected to open new avenues for developing advanced gas sensing devices and concepts with high sensing precision, selectivity, and robustness.