This study will have two asthma phenotypes and one control population. Patients will be recruited from the WTC EHC = 30 with WTC dust cloud exposure, patients will be recruited from the NYUBAR (n=30) and have asthma as defined by NIH guidelines, and control patients will be recruited from the NYUBAR (n=30) and will have no respiratory sx, no asthma diagnosis, or no WTC dust exposure.