The Internet of Things (IoT) generates large amount of data from networked devices. The IoT framework integrates IoT devices and gateways while leveraging modern computing technologies. It addresses the challenge of interoperability among sensors, edge computing processors, and network devices while ensuring seamless cloud connectivity. The use of standardized communication protocols for secure interactions with the cloud, end-user devices, and authorized personnel is detailed. The framework is illustrated through an air Cleanliness Monitoring Systems, smart city case study, highlighting the role of edge and cloud computing in data management and processing. Additionally, it emphasizes the need for a cost-effective IoT framework that supports environmental sustainability, including applications in renewable energy systems.