Long-term field calibration of low-cost metal oxide VOC sensor: Meteorological and interference gas effects

Hong, Gung-Hwa; Le, Thi-Cuc; Lin, Guan-Bo; Cheng, Hsiu‐Fung; Yu, Jhih-Yuan; Tekasakul, Perapong; Tsai, Chuen‐Jinn

doi:10.1016/j.atmosenv.2023.119955

Cited by 9 publications

(1 citation statement)

References 34 publications

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“…The use of MOX sensors in portable equipment for measuring air quality is increasingly popular. They are proving to be reliable in detecting the main pollutant gases (such as CO, NO 2 , and O 3 ) in cities [ 14 ], BTEX compounds (benzene, toluene, ethylbenzene, and xylenes) released into the environment through transportation and many industrial manufacturing processes and other industrial gases [ 15 , 16 , 17 ]. Also, they have been used for developing pollutant maps and monitoring indoor air quality [ 18 , 19 ].…”

Section: Introductionmentioning

confidence: 99%

Development of a Smartwatch with Gas and Environmental Sensors for Air Quality Monitoring

González,

Godoy,

Arroyo

et al. 2024

Sensors

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In recent years, there has been a growing interest in developing portable and personal devices for measuring air quality and surrounding pollutants, partly due to the need for ventilation in the aftermath of COVID-19 situation. Moreover, the monitoring of hazardous chemical agents is a focus for ensuring compliance with safety standards and is an indispensable component in safeguarding human welfare. Air quality measurement is conducted by public institutions with high precision but costly equipment, which requires constant calibration and maintenance by highly qualified personnel for its proper operation. Such devices, used as reference stations, have a low spatial resolution since, due to their high cost, they are usually located in a few fixed places in the city or region to be studied. However, they also have a low temporal resolution, providing few samples per hour. To overcome these drawbacks and to provide people with personalized and up-to-date air quality information, a personal device (smartwatch) based on MEMS gas sensors has been developed. The methodology followed to validate the performance of the prototype was as follows: firstly, the detection capability was tested by measuring carbon dioxide and methane at different concentrations, resulting in low detection limits; secondly, several experiments were performed to test the discrimination capability against gases such as toluene, xylene, and ethylbenzene. principal component analysis of the data showed good separation and discrimination between the gases measured.

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