Nowadays, the research community is increasingly focusing on sustainability, health concerns, smart industrial automation, and the development of low-cost gas sensors, which have become prominent topics of innovation. Among these, gas sensor technology is especially important for human health and environmental protection, as it enables the detection and measurement of hazardous gases in the air. As technology advances, real-time detection of harmful gases with long-term stability, low power consumption, high repeatability, excellent sensitivity, and outstanding selectivity remains a major challenge in the sensor field. Moreover, the transition of innovations from research laboratories to commercial markets presents another significant hurdle for both researchers and industry stakeholders. Therefore, it is essential to discuss the current status of gas sensor technology at both the laboratory and commercial levels to understand the existing landscape better. This chapter also explores the future scope of gas sensors, considering current technologies, ongoing challenges, and potential solutions.