The continuous evolution of gas sensor technologies is of critical significance in promoting environmental sustainability and supporting global efforts aimed at improving climate resilience. Recent advancements in material science have culminated in the creation of gas sensors characterized by heightened sensitivity and selectivity, leveraging sophisticated materials such as nanostructured metal oxides, perovskites, two-dimensional materials, and hybrid nanocomposites. These innovative materials display augmented surface-to-volume ratios, adjustable electronic properties, and exceptional stability, thereby contributing to the enhanced detection capabilities for a range of environmentally pertinent gases, including CO2, NOx, SO2, and volatile organic compounds (VOCs). The integration of self-sustaining technologies including piezoelectric, triboelectric, and photovoltaic systems has further facilitated the development of autonomous gas sensing platforms that exhibit low power consumption and extended operational lifetimes. Such technological advancements promote extensive deployment in both remote and urban settings, industrial complexes, and intelligent infrastructures, thereby obviating the necessity for external power sources. From a sustainability standpoint, the adoption of these technologies fosters real-time environmental monitoring, establishes early warning systems for hazardous emissions, and advocates effective air quality management practices. Furthermore, these sensors contribute to a diminished environmental footprint through their low-energy operation, utilization of recyclable materials, and scalable fabrication methodologies.
