Changes in Urban Planning in Response to Pandemics: A Comparative Review from H1N1 to COVID-19 (2009-2022)

The COVID-19 pandemic has brought enormous casualties and huge losses to cities around the world, causing urban planning to reflect on its serious inadequacy in public health crisis management. Looking back at the pandemics of modern history, urban planning has been dedicated to enhancing disease prevention capacity as well as improving the wellness of human beings. By systematically comparing the urban planning response between COVID-19 (2019) and its predecessor H1N1 (2009) in the literature, this paper seeks to explore how urban planning theories evolved through the pandemics and whether COVID-19 has led to possible new implications and directions for urban planning in the future. A total of 3129 related results with overlapping themes of "city", "pandemic", and "planning" in the database were narrowed down to 30 articles published between 2009 and 2019 on the topic of H1N1 and 99 articles published between 2020 and 2022 on the topic of COVID-19 after careful extraction and integration. Through bibliographic and detailed analysis, twelve urban theories used to fight against pandemics were identified. In addition, three main changes between urban planning responses to the H1N1 and COVID-19 pandemics were summarized: from focusing on stages of "in-pandemic" and "pre-pandemic" to focusing on stages of "post-pandemic", from global and national to local, and from the absence of an urban-built environment to a return to 'healthiness' in urban planning and design. Such comparisons are useful for examining the current situation and providing suggestions for a possible upcoming outbreak.