AIIMS Director Dr Randeep Guleria draws a direct link between air pollution and the worsening of the COVID-19 pandemic in Delhi. Air pollution impacts the lungs and can lead to a severe infection in patients. The onset of winter is likely to see a spike in coronavirus cases. Dr Guleria asked people to avoid large celebrations indoors and to check pollution levels before stepping out. As a precaution, doctors have asked people to stay indoors and step out only when the sun is out.