Jose Jimenez, a professor of chemistry at the University of Colorado Boulder, says that people exercising outdoors, an activity that is allowed under Gov. Polis’ stay-at-home order, should be exercising much farther than the designated 6 feet apart.

Jimenez said, “The best analogy is when someone is smoking tobacco or marijuana. Think about how many times you have walked by people and smelled tobacco or pot smoke that someone else had exhaled. Often, those people were farther away than six feet.”

“If that happens, we are inhaling the contents of someone’s lungs with limited dilution. Then we could inhale enough viruses to get sick, if the person exhaling the air was sick. Therefore, the (6-foot) rule, while useful, is not enough. We have to imagine that everyone we cross paths with is smoking, and we want to make sure that we never smell their smoke. So we want to keep larger distances, especially indoors or with light winds, or if they are upwind of us.”