Plotting the Lognormal Distribution

The cumulative distribution function N Dp) for a lognormally distributed aerosol population is given by (8.39). Defining the normalized cumulative distribution 

The point at which N Dp) = 0.84 occurs for In Dp+a = In Dpg +ln og or Dp+a = Dpgog. The slope of the line is related to the geometric standard deviation of the distribution. Lognormal distributions with the same standard deviation when plotted on probability 

FIGURE 8.8 Cumulative lognormal aerosol number distributions plotted on log-probability paper. The distributions have mean diameter of 1 pm and ag = 2 and 1.5, respectively. 

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