Urban areas are increasingly challenged by rising temperatures, demanding adaptive measures to strenghten community resilience. With hotter summers and more frequent, severe heatwaves, managing exposure to extreme heat has become a critical issue. The concept of "resilient cities" aims to mitigate the negative impact of extreme heat and air pollution. A key requirement for effective mitigation is the heat stress assessment. Currently, Belgrade, the largest urban area in region, lacks direct monitoring of micrometeorological conditions. This gap means there is limited spatial insight into heat stress and thermal comfort distribution. Real-time micrometeorological monitoring is essential for improving heat exposure assessment. This paper introduces mini smart mobile biometeorological station (sMaRT-mobile-BioMeteoS), a device that combines meteorological and air quality sensors to monitor heat stress, thermal comfort, and air pollution in urban environments.