| Title: | Developing a Low-Cost Wearable Personal Exposure Monitor for Studying Respiratory Diseases Using Metal-Oxide Sensors |
| Author(s): | Mallires KR; Wang D; Tipparaju VV; Tao N; |
| Address: | "School for Engineering of Matter, Transport and Energy, Arizona State University, Tempe, AZ 85287 USA, and also with The Biodesign Institute, Arizona State University, Tempe, AZ 85287 USA. The Biodesign Institute, Arizona State University, Tempe, AZ 85287 USA. School of Electrical, Computer and Energy Engineering, Arizona State University, Tempe, AZ 85287 USA, and also with The Biodesign Institute, Arizona State University, Tempe, AZ 85287 USA" |
| DOI: | 10.1109/jsen.2019.2917435 |
| ISSN/ISBN: | 1530-437X (Print) 1530-437X (Linking) |
| Abstract: | "Global industrialization and urbanization have led to increased levels of air pollution. Those with respiratory diseases, such as asthma, are at the highest risk for adverse health effects and reduced quality of life. Studying the relationship between pollutants and symptoms is usually achieved with data from government air quality monitoring stations, but these fail to report the spatial and temporal resolution required to track a person's true exposure, especially when the majority of their time is spent indoors. We develop and build eight wrist-worn wearable devices, weighing only 64 g, to measure known asthma symptom triggers: ozone, total volatile organic compounds, temperature, humidity, and activity level. The devices use commercial off-the-shelf components, costing under $150 each to build. This report focuses on the design, calibration, and testing of the devices. Emphasis is placed on the calibration of a metal-oxide-semiconductor gas sensor for detecting ozone, which is a difficult task because of the large variations in ambient temperature and humidity found when using a wearable device. Examples of testing the devices in four real environments are also discussed: 11 days inside a well-ventilated laboratory, ten days outdoors during the summer, alternating the devices between indoor and outdoor environments to examine their response to quickly changing environments, and a field test where scripted activities are performed for a full day. The work demonstrates a wearable device for environmental health studies and addresses the challenges of existing sensors for real-world applications" |
| Keywords: | Air quality Mos asthma calibration environmental monitoring gas sensor metal oxide semiconductor ozone personal monitoring volatile organic compounds wearable device; |
| Notes: | "PubMed-not-MEDLINEMallires, Kyle R Wang, Di Tipparaju, Vishal Varun Tao, Nongjian eng U01 EB021980/EB/NIBIB NIH HHS/ 2019/09/15 IEEE Sens J. 2019 Sep 15; 19(18):8252-8261. doi: 10.1109/jsen.2019.2917435. Epub 2019 May 17" |
