John,

By now, we all know we should be wearing a mask whenever we go out in public. But how do you know it's fitting correctly? It's okay to pull your mask down when no one is nearby, right? Does it really have to cover your nose?

We asked public health expert Dr. Kelly Henning to share some DOs and DON'Ts of mask wearing for our Road to Recovery series. In less than two minutes, she clarifies some of the most common questions about how and when we need to wear masks:

These guidelines can help you stay safe -- without creating unnecessary risk for your neighbors by improperly wearing a mask. Want to know the best way to wear your mask? Then DO watch our DOs and DON'Ts video -- and share with your friends!

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Thanks (for wearing a mask),

Bloomberg Philanthropies