Fig. 4

Sources of variation in personal exposures in the ENIGMA cohort. A) Dot plot of personal PM10 measures for subjects with at least 2 PM10 observations. Each column in the plot represents a subject. Dots indicate individual PM10 measures and lines indicate the range of personal PM10 for a subject. B) Dot plot of personal NO2 measures for subjects with at least 2 NO2 observations. C) Sources of variability in personal exposure data. Variation that can be explained by season, percent of time the participant wore the monitor, between subject differences, and the remaining within subject variability are shown in purple, blue, green and pink, respectively