Background: Research on the impact of the environment on COVID-19 lacks a full-comprehensive perspective, and neglecting the multiplicity of the human-environment system can lead to misleading conclusions. We attempted to reveal all environmental-to-human and human-to-human determinants that influence the transmission of COVID-19.
Methods: We estimated the daily case incidence ratios (CIR) of COVID-19 for prefectures across mainland China, and used a mixed-effects mixed-distribution model to study the association between the CIR and 114 considered factors related to climate, atmospheric environmental quality, terrain, population, economic, human mobility as well as public health control measures (PHCMs).
Results: CO, O3, PM10 and PM2.5 were positively linked with CIR, but the effect of NO2 was negative. The temperature had no significant association with CIR, and the daily minimum humidity was a significant negatively predictor. National emergency response level was negatively associated with CIR until with a lag of 15 days. Higher accumulated destination migration scale flow from the epicenter and lower distance to the epicenter (DisWH) were associated with a higher CIR, however, the interaction between DisWH and the time was positive. In China, the more economically developed and more densely populated cities have a higher probability of CIR occurrence, but they may not have a higher CIR intensity.
Conclusion: The COVID-19 pandemic’s diffusion patterns are caused by a multiplicity of environmental, economic, social factors as well as public health control measures PHCMs. First, multiple pollutants carried simultaneously on particulate matter act in a synergistic way to affect COVID-19 transmission. Second, the temperature has a limited impact on the spread of the epidemic. Third, PHCMs must last for at least 15 days or longer before the effect has been apparent. Fourth, preventing the introduction of the epidemic between cities seemed to be more complex and difficult than controlling the growth of the epidemic within the city. China's relatively cautious response to the epidemic could provide lessons for countries that are still experiencing a health emergency and help to prevent future pandemics similar to COVID -19.