COVID-19 pandemic: the role of risk factors related to urban space (analytical review)

Comfortable urban environment plays a key role in protecting health of people residing in large urban settlements. At the same time, urban space has some peculiarities including high population and building density, imperfect traffic infrastructure, irrational planning decisions, elevated levels of ambient air pollution, heat islands and lack of urban green spaces. All these features of any urban space are significant health risk factors able to facilitate spread of respiratory diseases. This was the most evident during the COVID-19 pandemic. The analytical review examines the results of studies focusing on impacts exerted by these unfavorable urban conditions on COVID-19 infection, incidence, hospitalization and mortality in cities across the globe. Influence of elevated population density on COVID-19 infection is shown to be ambiguous as compared to other risk factors. More reliable data are available on the impact of air pollutants, especially PM, on incidence and mortality rates from the infectious disease in question. Also, the COVID-19 virus and abnormally high temperatures were shown to produce combined effects on mental health during the pandemic. To reduce levels of infection in urban population, a suggestion is to further develop urban infrastructure providing people with retail and other necessary facilities within a walking distance (15 minutes). An important conclusion has been made by experts on elevated risks of infection in dense foot traffic as compared to public buildings. Therefore, it is important to improve communications about the necessity of social distancing. Urban development that aims to reduce infection with respiratory diseases should involve better street aeration. The results of these studies in various cities across the globe gave grounds for making management decisions on providing better mobility in suburban areas in a more comfortable natural environment, developing green areas in cities, and reducing negative effects of the warming climate on heat islands and elevated levels of ambient air pollution. Large open green spaces are the most effective in this respect.