In total, 291 microenvironment measurements were collected from
55 households (6.6% of the cohort), 8 representative outdoor locations,
and 8 schools. Fifty-eightwere discarded: in 14 cases repeatedweighing
produced differences greater than 0.1mg, 13 had damage to the filter, in
15 cases there was equipment failure or inaccurate technique and in 16
cases there were mistakes in timing, labeling or location. Fifty-nine
samples were below the LOD. In total, 110 days worth of air pollution
data were gathered from across the various microenvironments, with
a cumulative sampling duration of 2649 h. Table 1 shows the average
duration and total time at each location.