“…However, for exposure data, it is suggested that the W test is most appropriate, particularly for sample populations with less than 50 measurements [2][3][4]. For exposure samples, including area samples as reported in the article [1], previous studies [3,7,10,11,17] have suggested the distribution to be nonnormal and to best fit a logarithmic function. When these data, the exposure samples, are transformed using logarithms, distribution would then appear normal.…”