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Our results suggest that predictions of "indoor PM2.5 of ambient origin" are improved when ambient PM2.5 is treated as a combination of four distinct particle types with differing infiltration behavior (primary combustion, secondary sulfate and organics, secondary nitrate, and mechanically generated PM) rather than as a "single internally mixed entity".
True exposure was defined as personal exposure to PM2.5 of ambient origin.
PM2.5 of ambient origin contributed 62%, on average, to the total personal PM2.5.
To estimate personal PM2.5 of ambient origin we used the SO 4 2 − tracer method.
In addition, personal PM2.5 of ambient origin was estimated rather than measured.
People are therefore exposed to concentrations of PM2.5 of ambient origin at near ambient concentrations for 24-hr each day.
Similar(19)
Epidemiological studies routinely use central-site particulate matter (PM) as a surrogate for exposure to PM of ambient (outdoor) origin.
The indoor environment is an important venue for exposure to fine particulate matter (PM2.5) of ambient (outdoor) origin.
Freeman, S. E. et al. The origins of ambient biological sound from coral reef ecosystems in the Line Islands archipelago.
However, an enormous number of different chemical species are associated with the various types of ambient particles, depending upon their source origins (e.g., Cooper and Watson 1980).
Our results suggest that associations of ambient PM exposures with newborn size and adiposity differ between white British and Pakistani origin infants.
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