A few weeks ago they linked air pollution to where was hardest hit by CV.
It is worth noting that areas of high air pollution also affect how much vit D you absorb. (And the air pollution obviously affects your lungs anyway).
As per the other threads it is worth supplementing if you think you are low.
(Vit d affects things like the cytokine storm).
But you are likely to be deficient if you
Always use suntanlotion
Are BAME
Arent getting out in the middle of the day so shift workers
And as i say living in a highly polluted city might affect your levels too.
And over 45 (i think) do not absorb it as much
Worth noting too that levels in childrens vitamins are often below the recommended by nhs.
The research suggests the people in icu are deficient.
It isnt in many foods so main sources sun or vitamins