DETROIT Warm weather across the country is driving people to the comfort of indoor air conditioning -- but some were wondering if it was a good idea amid the coronavirus (COVID-19) outbreak. A detailed investigation concluded that the virus was most likely spread to distant tables by the flow of air from the air conditioner. One important concern is that air conditioning systems could either blow the aerosol more quickly from an infected person to nearby people or by recirculating the air, could spread virus even farther. High efficiency HEPA filtration systems would trap infectious particles in the air stream, specific wavelengths of ultraviolet lights embedded in the duct work or near air registers could kill virus, and finally existing systems could be redesigned to bring in fresh uncirculated outdoor air to dilute any infectious particles in the air. Whether its summer or winter -- all businesses and schools should begin to consider how they can efficiently improve indoor air quality.