The NORAH Blood Pressure Study was unable to verify an association between air transportation noise and blood pressure. But the study does provide indications that there are groups that react more sensitively to transportation noise than others with a rise in blood pressure values. However, even the results for sensitive groups do not reach statistical significance. In order to identify the health consequences of high air transportation noise exposure, further studies would have to be carried out on selected groups of persons. As the NORAH scientists point out: we must not forget that the reactions to chronic stress vary greatly from person to person.