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다국어 초록 (Multilingual Abstract)

The COVID-19 pandemic was caused by a highly contagious coronavirus that has triggered control actions such as social distancing and lockdowns worldwide. COVID-19 control actions have resulted in improved air quality locally and around the world in the short-term by limiting human activity. We analyzed the impacts of social distancing and transboundary pollutants on air quality changes and examined the corresponding health benefits focusing on two domestic cities (Seoul and Daegu) in Korea where the spread of coronavirus was severe. During the COVID-19 pandemic, PM2.5, PM10, and NO2 concentrations decreased significantly by 31%, 61%, and 33%, respectively, compared to the previous three years. In particular, the PM2.5/PM10 ratio fell 24.5% after the implementation of social distancing, suggesting a decrease in anthropogenic emissions. Moreover, we found that the air quality index (AQI) also improved significantly, with a focus on reducing exposure to sensitive groups. In Seoul and Daegu, improved air quality prevented 250 and 78 premature deaths, and health costs were USD 884 million and USD 278 million, respectively. On the other hand, health loss due to COVID-19 deaths was in sharp contrast to USD 7.1 million and USD 543.6 million. Our findings indicate a significant association between COVID-19 prevalence patterns and health outcomes. This thesis was written by editing the manuscript that I submitted to 'atmosphere' and 'applied sciences' in 2020.

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목차 (Table of Contents)

1. Introduction 5
2. Changes in Air Quality during the COVID-19 pandemic 14
2.1. Material and Methods 14
2.2. Results and Discussion 24
3. Assessment of Air Pollution Reduction during Social Distancing and Associated Health Effect 46

1. Introduction 5
2. Changes in Air Quality during the COVID-19 pandemic 14
2.1. Material and Methods 14
2.2. Results and Discussion 24
3. Assessment of Air Pollution Reduction during Social Distancing and Associated Health Effect 46
3.1. Material and Methods 46
3.2. Results and Discussion 52
4. Estimation of Air pollution Reductions and Exposure: Focusing on PM2.5 67
4.1. Material and Methods 67
4.2. Results and Discussion 69
5. Conclusion 71

참고문헌 (Reference)

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