Application segmentation allocates market demand across end‑use environments, directly shaping the Intelligent Indoor Air Quality Detector market size. Residential installations account for roughly 35% of sales, driven by consumer awareness of indoor health and smart‑home adoption. Commercial spaces—offices, retail, and hospitality—represent about 30%, reflecting regulatory pressure and corporate sustainability programs that prioritize occupant well‑being. Industrial facilities, including manufacturing plants and warehouses, capture 15% as they require continuous monitoring for worker safety and compliance with emission standards. The Healthcare sector, encompassing hospitals and clinics, holds 12% of the market, where precise pollutant detection supports infection control and patient care. Finally, Transportation (aircraft cabins, trains, and buses) contributes the remaining 8%, motivated by passenger comfort mandates. This application‑focused taxonomy enables precise revenue attribution, guiding strategic investments and product development aligned with the distinct performance and regulatory needs of each segment.