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Fine particulate matter (PM2.5) is an important environmental factor affecting human health. However, most studies on PM2.5 and health have used data from fixed monitoring sites to assess PM2.5 exposure, which may have introduced misleading information on the exposure-response relationship. We aimed to assess the effect of short-term personal PM2.5 exposure on lung function in patients with chronic obstructive pulmonary disease (COPD) and asthma. To achieve this, we conducted a longitudinal panel study among 37 COPD patients and 45 asth