Fig. 7.

Comparison of number concentrations measured with the passive method to that measured with the Burkard method in the spring study. Box indicates the interquartile range, whiskers are the upper and lower adjacent values, square is the mean, central line is the median, and diamonds are outliers. The mean passive concentration aligns generally with the median Burkard concentration for most sampling periods as with the summer study but has a much wider distribution within the Burkard data.