Local governments have been focusing on outdoor dining for good reason: As the weather warms and we need air conditioning to keep spaces cool, the risk of spreading virus particles can increase indoors. Recent research from the University of Oregon and the University of California, Davis, found that the path of air circulation within a restaurant plays an important role limiting the spread of the virus, particularly because the air stream in a restaurant can carry virus particles beyond the six-foot social distancing guideline. However, risks improve in situations with a window and an exhaust fan helping to manage air flow. The research team created a visual model to show the differences in transmission in a closed room where indoor air is recirculated and in a room that circulates some outdoor air through a window. While circulating outdoor air isn’t workable in every restaurant or every part of the country, Boston 25 News reports that Kevin Van Den Wymelenberg, one of the authors of the research, said you can test a building for the presence of the virus and then take steps to adjust air circulation patterns to minimize risk in your facility.