Air pollution would also lower sun exposure, decreasing vitamin D levels. Wuhan was so polluted that some Chinese were willing to risk imprisonment by publicly protesting.

NY City’s tall buildings also block sunlight.

Link between air pollution and coronavirus mortality in Italy could be possible

Date:
April 6, 2020
Source:
Aarhus University
Summary:
A group of scientists has found another small piece in the puzzle of understanding COVID-19. Looking for reasons why the mortality rate is up to 12% in the northern part of Italy and only approx. 4.5% in the rest of the country, they found a probable correlation between air pollution and mortality in two of the worst affected regions in northern Italy.