Early challenges in environmental monitoring station adoption—such as weak environmental signal capture, electromagnetic interference (EMI), and poor stability in harsh outdoor environments—have been overcome by specialized PCB assembly technologies, particularly rigid-flex PCBs and high-precision surface mount technology (SMT). These innovations effectively enhance the sensitivity of analog front-ends for capturing faint environmental signals (including temperature, humidity, PM2.5, and gas concentration), while integrating EMI shielding layers to eliminate interference from external electronic devices and outdoor electromagnetic sources. Rigid-flex PCBs, in particular, balance compact form factors with reliable signal transmission, supporting the miniaturization of fixed and portable environmental monitoring stations without compromising detection accuracy. This technological leap has enabled environmental monitoring station PCB assemblies to outperform traditional environmental monitoring circuits in key areas: