A ventilation based mathematical comparison of pathogen inhalation of groups of persons exposed to the exhaled breath of one infected person for worst case design exposure times is made for thirteen transportation and building settings all of which, with the exception of offices, typically have high occupancy densities (ODs). The comparison identifies intercontinental air travel with flights up to 15 hours as the setting of highest risk followed by theater, sports arena, classroom grades 9+, continental flight, commuter train, classroom grades 3-8, bar, restaurant, gambling casino, lecture hall, office and subway in that order. The range of inhalation values calculated indicates ventilation standards are far from uniformly protective against airborne infectious disease transmission for worst case exposure periods.