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The COVID-19 pandemic was caused by a highly contagious coronavirus that has triggered worldwide control actions such as social distancing and lockdowns 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 using open data 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

Changes in Air Quality during the COVID-19 Pandemic and Associated Health Benefits in Korea