Design and Implementation of an IoT Based Indoor Air Quality Monitoring System

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Department of Electronic and Telecommunication Engineering, International Islamic University Chittagong


Smart cities follow different strategies to face public health challenges associated with socio-economic objectives. Buildings play a crucial role in smart cities and are closely related to people’s health. Moreover, they are equally essential to meet sustainable objectives. People spend most of their time indoors. Therefore, indoor air quality has a critical impact on health and well-being. With the increasing population of elders, ambient-assisted living systems are required to promote occupational health and wellbeing. Furthermore, living environments must incorporate monitoring systems to detect unfavorable indoor quality scenarios in useful time. This paper reviews the current state of the art on indoor air quality monitoring systems based on Internet of Things and wireless sensor networks in the last five years (2014–2019). This document focuses on the architecture, microcontrollers, connectivity, and sensors used by these systems. The main contribution is to synthesize the existing body of knowledge and identify common threads and gaps that open up new significant and challenging future research directions.Air quality monitoring provides raw measurement of gases and pollutant concentrations, which can then be analyzed and interpreted. Air pollution is a concern in many urban areas and be the major reason for respiratory problems among many people, monitoring the air quality may help many distress from respiratory problems and diseases, and thereafter informing engineering and policy decision makers to recover the quality of air. Major contributor’s air causing respiratory problems are Fine particles produced by the burning of fossil fuel, noxious gases, Ground-level ozone g), Volatile organic compounds. A prototype for air pollution monitoring device has been developed to measure the concentration of CO2 and gases, monitoring at a specified rate and communicating, to notify to any wireless device when the threshold of these gases is reached. Though the prototype can be extended across regions for high-fidelity emissions monitoring to explore the effects of environmental factors on intra-hour air quality.


Thesis, Department of Electronic and Telecommunication Engineering