NEWS YOU CAN USE–IT’S PRETTY SAFE TO BE OUTDOORS: From an interview with an Israeli epidemiologist on Covid-19:

Q. What if someone is out jogging and they’re breathing really hard and they breathe on you? They don’t cough or sneeze, they just exhale in your direction? Is that cause for concern?

A. We usually say you are in real danger if you spend 10 minutes with a person at a distance of less than two meters. So hopefully this guy is running fast enough so that you are not near him for 10 minutes.

That does not mean it is impossible to get infected from his breath. It is possible, but you’d have to be completely unlucky. In a park, or in the open air, the virus would be more diluted. If someone spits out of doors, however, they could infect people.