Indoor carbon dioxide (CO\textsubscript{2}) can rapidly accumulate to form invisible pollution \textit{hotspots}, posing significant health risks due to its odorless and colorless nature. Despite growing interest in wearable or stationary sensors for pollutant detection, effectively visualizing CO\textsubscript{2} levels and engaging individuals remains an ongoing challenge. In this paper, we develop a portable wrist-sized pollution sensor that detects CO\textsubscript{2} in real time at any indoor location and reveals \textit{CO\textsubscript{2} bubbles} by highlighting sudden spikes. In order to promote better ventilation habits and user awareness, we also develop a smartphone-based augmented reality (AR) game for users to locate and disperse these high-CO\textsubscript{2} zones. A user study with $35$ participants demonstrated increased engagement and heightened understanding of CO\textsubscript{2}’s health impacts. Our system's usability evaluations yielded a median score of $1.88$, indicating its strong practicality.
ACM CHI Conference on Human Factors in Computing Systems