Figure 3

Relative humidity versus temperature for all data. In these scatterplots the difference between tropical nations (3A, N = 766) and Australia's temperate cities in southern hemisphere winter (3B, N = 110) can be seen on a contour map of risk of transmission by aerosol. The contour lines are based on aerosol transmission time course experiments over 7 days by Lowen et al. together with support from other literature. Thus, the 25%_G7 transmission line indicates that over 7 days under similar controlled conditions 25% of hosts exposed by aerosol would become ill. (See equation 2, Contagion probability estimate by time expressed in days for how to calculate risk based on time in location.) For general purposes of evaluating risk, the distance of points below the chosen transmission line can be visually evaluated by inspection. In these graphs, datapoints consist of temperature and RH for: Bank Branch, Club, Casino, Church, College, Dining, Dwellings, Elevator, Entertainment, Gym, Hospital, Hotel, Mall, Office, Pharmacy, Public site, Retail, Terminal, and Transport, for all nations. To see cumulative distribution data showing distance from the 25%_G7 transmission risk contour line for these data, refer to Figure 4.