KMID : 1156220210470060521
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Journal of Environmental Health Sciences 2021 Volume.47 No. 6 p.521 ~ p.529
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Evaluation of Population Exposures to PM2.5 before and after the Outbreak of COVID-19
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Kim Dong-Jun
Min Gi-Hong Choe Yong-Tae Shin Jun-Shup Woo Jae-Min Kim Dong-Jun Shin Jung-Hyun Jo Man-Su Sung Kyeong-Hwa Choi Yoon-Hyeong Lee Chae-Kwan Choi Kil-Yoong Yang Won-Ho
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Abstract
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Background: The coronavirus disease (COVID-19) has caused changes in human activity, and these changes may possibly increase or decrease exposure to fine dust (PM2.5). Therefore, it is necessary to evaluate the exposure to PM2.5 in relation to the outbreak of COVID-19.
Objectives: The purpose of this study was to compare and evaluate the exposure to PM2.5 concentrations by the variation of dynamic populations before and after the outbreak of COVID-19.
Methods: This study evaluated exposure to PM2.5 concentrations by changes in the dynamic population distribution in Guro-gu, Seoul, before and after the outbreak of COVID-19 between Jan and Feb, 2020. Gurogu was divided into 2,204 scale standard grids of 100 m¡¿100 m. Hourly PM2.5 concentrations were modeled by the inverse distance weight method using 24 sensor-based air monitoring instruments. Hourly dynamic population distribution was evaluated according to gender and age using mobile phone network data and time-activity patterns.
Results: Compared to before, the population exposure to PM2.5 decreased after the outbreak of COVID-19. The concentration of PM2.5 after the outbreak of COVID-19 decreased by about 41% on average. The variation of dynamic population before and after the outbreak of COVID-19 decreased by about 18% on average.
Conclusions: Comparing before and after the outbreak of COVID-19, the population exposures to PM2.5 decreased by about 40%. This can be explained to suggest that changes in people's activity patterns due to the outbreak of COVID-19 resulted in a decrease in exposure to PM2.5.
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KEYWORD
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COVID-19, particular matter (PM2.5), dynamic population, population exposure
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