A woman goes running while wearing a mask in Lisbon, Portugal, on March 29, 2020.  | Getty Images

Understanding the key concepts of transmissibility and infectious dose should reassure you.

Under social distancing, we’re all doing our best to stay sane, and one of the best ways to maintain sanity is to go out for some nice fresh air. But venturing outside can be stressful if you’re worried that the very air is full of virus particles just waiting to infect you.

So, how worried should you be that any time you go outside, you’ll contract coronavirus from a fellow pedestrian, runner, or cyclist who happens to exhale as they pass by?

The answer is, you probably don’t need to freak out about it. As long as you’re maintaining at least 6 feet of distance from other people and you’re not in a