The integration of advanced ventilation systems with environmental air monitoring presents a major challenge in modern building management and urban development. The structure of buildings becomes more airtight, energy efficient indoor air quality (IAQ) becomes increasingly difficult. This paper investigates the need for ventilation strategies using real-time data and Internet of Things (IoT) technology to ensure a better environment. We introduce a decentralized smart ventilation system that employs control algorithms and localized sensor data to enhance ventilation performance. Our approach incorporates sensors in each room or zone to continuously monitor temperature, humidity, and occupancy levels. This data is transmitted to decentralized control units, which process the information to adjust ventilation settings according to the specific needs of each area. The above approach is useful and tested in the Earth air Tunnel cooling system on university premises.