Abstract:
Understanding how exposure to particulate matter impacts human health is complex. Personal exposure is a function of the pollution
concentrations measured at any given place and time. The health impacts of this exposure are, in part, determined by how high
pollutant concentrations are and how much pollution can potentially enter the body. This study considered data gathered in the
winter of 2013 in a low-income community on the Mpumalanga Highveld, South Africa, which is a geographical area known for its
high air pollution levels. Data collected by GPS monitors worn by individuals in the community were used to understand in which
microenvironments people spend most of their time. Participants spent time in five main micro-environments: (highest rank first) inside
a house, directly outside a house, on a dirt road, on a tar road, and on an open field. Eight days’ worth of ambient, indoor and personal
particulate matter measurements were paired with individual GPS positioning data for one study participant. We identified pollutant
concentrations where the person spent time and how much particulate matter the person potentially inhaled. Highest concentrations
were measured inside the dwelling and directly outside the dwelling of the individual. When comparing directly (ranging from 0.02 –
0.76 mg) - and indirectly (0.02 – 0.34 mg) derived time-weighted potential intake doses, directly derived intake doses were higher and
more likely to represent how much particulate matter was potentially inhaled by the participant. This study suggests that people living
in communities on the Mpumalanga Highveld are exposed to unacceptably high air pollution levels in places in which they spend most
of their time. Direct exposure and intake dose assessments are an important element of environmental health studies to supplement
data collected by stationary monitors in order to better understand exactly what people are breathing.
