Emerging technologies are utilised by the smart city in this world of digital to become a society of intelligence. The ecosystem of the digital smart city paradigm is shifted by the adoption of the technology of blockchain. The applications of the spectrum broad of blockchains provide solutions for the problems that arise in different areas such as cryptocurrency, management of risk, services of financial, public services, the Internet of things, and social services. To make the ecosystems sustainable the network of smart city revolutionizing by the technology of blockchain and artificial intelligence. These technologies are combined with traditional technologies to make an enhanced version of cities more enhanced and advanced the sensors and actuators which are based on ICT technology. To make smart cities sustainable and to complete these goals technological advancement faces some challenges and also gains opportunities. The Internet of Things is becoming a vital part of smart cities in various parts like smart transportation and shopping, for waste management. The resources and ecosystem of smart cities can be controlled with the help of IoT in a better way which will be beneficial. There is a need to achieve environmental sustainability development it can be possible by using the art-sensor-based big data application which analyses the previous smart cities’ models and techniques which are data procedure stages and figuring the models for the smart cities. This research also performs a literature review of existing studies to determine the impact the IoT sustainability. In this research, we also discuss the solution of enhancement and different factors that affect IoT sustainability. Also, this study includes some issues the research of the future depends on and some suggestions for security. The smart cities’ environment and resources may be enhanced with the aid of the IoT (Internet of Things) which will be advantageous.