This project focuses on developing a low-cost, scalable methane sensing system to support real-time monitoring of emissions in urban and industrial environments. In collaboration with Climate Action California, the goal is to design a portable device capable of detecting methane leaks and transmitting data for analysis, enabling faster identification of emission hotspots. By improving accessibility to reliable environmental data, this system aims to support climate mitigation efforts and inform more effective policy and infrastructure decisions. The project emphasizes practical deployment, data-driven insights, and potential scalability for broader environmental monitoring applications.