Air quality is typically registered by established systems of high-precision devices in order to monitor compliance with limit values. Nevertheless, these existing air quality measuring techniques have limitations: they cannot observe spatiotemporal variations in high resolution, provide data about target-specific monitoring, personal exposure, real-time alertness, feedback and control mechanism and many more. Recent technical developments provide new solutions for smart sensors that can measure pollutants in real-time and at small scales and have attracted the interest of a broad range of environmental researchers as well as authorities and local communities.