conditions in susceptible populations. The objective of this panel study is to investigate an
association between particulate matter and the peak expiratory flow rate (PEFR) in the
elderly and to compare estimated risks using PM10 or PM2. 5 levels as a measure of
exposure. During a 2-year longitudinal follow-up study, we contacted subjects living in an
asylum for the elderly, provided them with a mini-Wright peak flow meter, and instructed to …