Abstract
The impact of air quality on health and on life comfort is well established. In many societies, vulnerable elderly and young populations spend most of their time indoors. Therefore, indoor air quality monitoring (IAQM) is of great importance to human health. Engineers and researchers are increasingly focusing their efforts on the design of real-time IAQM systems using wireless sensor networks. This paper presents an end-to-end IAQM system enabling measurement of CO2, CO, SO2, NO2, O3, Cl2, ambient temperature, and relative humidity. In IAQM systems, remote users usually use a local gateway to connect wireless sensor nodes in a given monitoring site to the external world for ubiquitous access of data. In this work, the role of the gateway in processing collected air quality data and its reliable dissemination to end-users through a web-server is emphasized. A mechanism for the backup and the restoration of the collected data in the case of Internet outage is presented. The system is adapted to an open-source Internet-of-Things (IoT) web-server platform, called Emoncms, for live monitoring and long-term storage of the collected IAQM data. A modular IAQM architecture is adopted, which results in a smart scalable system that allows seamless integration of various sensing technologies, wireless sensor networks (WSNs) and smart mobile standards. The paper gives full hardware and software details of the proposed solution. Sample IAQM results collected in various locations are also presented to demonstrate the abilities of the system.
Highlights
Indoor and outdoor air quality (AQ) is becoming a major concern for the public and policy makers.Recently, Europe and USA have reduced the emissions of several airborne pollutants [1,2] such as carbon monoxide (CO), sulfur dioxide (SO2 ) and lead (Pb)
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Summary
Indoor and outdoor air quality (AQ) is becoming a major concern for the public and policy makers. Collecting data concurrently from various locations and making it available ubiquitously enables interested users to be informed about AQ in their chosen or planned places It is often difficult for air conditioning managers who control ventilation inside buildings to obtain real-time indoor air quality (IAQ) data, and resort to overventilation to ensure safe levels of pollutants in their buildings. Brienza et al [5] presented a low-cost cooperative monitoring tool that allows a real-time monitoring of the concentration of some polluting gases in various areas of a city In this solution, the system is confined to outdoor AQM and at each location individual sensor boards are installed to post the data measurements directly through the Internet to a centralized server. We propose an end-to-end solution for IAQM; the system integrates wireless AQ sensor nodes, advanced embedded gateways, and an IoT server.
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