Impact of environmental factors on COVID-19 pandemic: A narrative review

The World Health Organization declared COVID-19 disease as a pandemic after the first cases from China were reported in December 2020. COVID-19, caused by SARS-CoV2 (severe acute respiratory syndrome), spreads by contact with infected droplets. The incubation period ranges from 2 to 14 days with initial symptoms of fever, sore throat, cough, fatigue, malaise, and breathlessness. In patients with co-morbidities and the elderly, it progresses to pneumonia, acute respiratory distress syndrome, and multi-organ failure. Regarding the impact of the environment on the spread of the corona virus, more research is going on. Environmental factors including atmospheric temperature, ventilation, climate change, and humidity have been studied to understand the effect of these factors on COVID-19 spread. We have evaluated studies to date related to the environmental effect on COVID-19 and summarized them for better understanding.