A graphically striking finding shown in Figure 1 in the article by Skloot et al1 is that, given the variability in the change in FVC and FEV1 at examination 2, change is not skewed toward excessive loss, as would be seen when progressive impairment had developed in a significant portion of the subjects. Similarly impressive is the resolution of BD responsiveness in fully 72% of those subjects who were initially responsive to BDs. Since 9% of the group responded at examination 1 and 8% responded at examination 2, it is obvious that the two sets of responders were not the same. That the majority of those who were responsive to BDs were not responsive on follow-up is noteworthy. Equally noteworthy, the onset of BD responsiveness 32.4 months after the first test and 4 to 6 years after the initial insult at ground zero bears explanation and suggests that it is not attributable to this distant exposure.