# Low-Cost IoT Air Quality Monitoring Station Using Cloud Platform and Blockchain Technology
###### Abstract  
Air pollution is a growing concern due to severe threats to public health and the environment. The need for reliable air quality monitoring solutions has never been more critical. This research paper introduces an innovative approach to addressing this challenge by deploying a low-cost Internet of Things (IoT) air monitoring station and providing a blockchain technology solution to enhance environmental data transparency, reliability, and accessibility. Our paper adopts a concept of merging IoT and blockchain technologies and collecting some parameters that help to assess air quality by using three sensors, DHT11, MQ7, and MQ135, to collect temperature, humidity, carbon monoxide, and carbon dioxide parameters, respectively, to measure the gases and thus indicate the air quality within the surrounding area. Collecting and sharing these types of valuable data will be very important for various stakeholders, such as governmental bodies, researchers, and the public. This approach is consistent with the principles of sustainable development, facilitating informed decision-making and promoting eco-friendly policies. This research explores the technical architecture of the IoT air monitoring stations, offering a promising solution for addressing air pollution concerns while promoting sustainable development goals. The proposed system is a model for leveraging emerging technologies to advance environmental monitoring and create smarter, livable cities. This approach aligns with the principles of sustainable development and eco-friendly initiatives. This research offers a promising model for enhancing environmental monitoring efforts and advancing the creation of smarter, more sustainable urban environments. The proposed IoT, cloud platform and blockchain-based system not only addresses pressing air pollution challenges but also sets a benchmark for leveraging emerging technologies in environmental science. Internet of Things; blockchain; air pollution; sustainable development +
Footnote †: journal: Applied  
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climate change and quality of life on earth are included in the Sustainable Development Goals (SDGs) of the United Nations, specifically in numbers 3, 11, 13, and 15 [3]. We need to monitor air quality everywhere in cities, especially in crowded and industrial zones, so there is a great need for IoT air monitoring stations of low cost to monitor the quality of the air continuously throughout the day. To effectively address climate change and work toward sustainable development, it is crucial to have access to reliable and comprehensive information on weather patterns and pollution levels. Monitoring weather conditions through an IoT weather station can provide valuable data that can be utilized by policymakers, researchers, and communities to make informed decisions and implement a comprehensive strategy to take appropriate action and mitigate the far-reaching and long-lasting impacts of climate change. Furthermore, IoT weather stations can also contribute to other sectors, such as transportation, agriculture, energy, and water resources. High-accuracy and real-time data obtained from IoT weather stations can be used to optimize transportation routes and schedules, ensuring efficient and safe movement of goods and people. Additionally, the data can inform agricultural practices, allowing farmers to make informed decisions regarding irrigation, planting, and pest control services, ultimately leading to higher productivity and sustainable agricultural practices. The deployment of cost-effective wireless sensor networks empowers these systems to accurately measure levels of harmful gases, temperature, and humidity. The systems rely on application software for cloud-based data analytics and microcontrollers to process sensory inputs.