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. 2010 May 18;118(9):1251–1256. doi: 10.1289/ehp.1001924

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Relationship between exposure to dust cloud on 9/11 and (A) mean threshold (± SE) for detection of nasal irritation from n-butanol, and (B) mean (± SE) mucociliary transit time. Group 1: person was directly in the dust cloud from the collapse of the towers (n = 22); group 2: person was exposed to some/significant dust, but not in the cloud (n = 22); group 3: person was not exposed to dust (all but one was not present in lower Manhattan on 9/11 (n = 57); group 4: matched controls with no WTC exposure.