Different relationships between personal exposure and ambient concentration by particle size
2018
Guak, Sooyoung | Lee, Kiyoung
Ambient particulate matter (PM) concentrations at monitoring stations were often used as an indicator of population exposure to PM in epidemiological studies. The correlation between personal exposure and ambient concentrations of PM varied because of diverse time-activity patterns. The aim of this study was to determine the relationship between personal exposure and ambient concentrations of PM₁₀ and PM₂.₅ with minimal impact of time-activity pattern on personal exposure. Performance of the MicroPEM, v3.2 was evaluated by collocation with central ambient air monitors for PM₁₀ and PM₂.₅. A field technician repeatedly conducted measurement of 24 h personal exposures to PM₁₀ and PM₂.₅ with a fixed time-activity pattern of office worker over 26 days in Seoul, Korea. The relationship between the MicroPEM and the ambient air monitor showed good linearity. Personal exposure and ambient concentrations of PM₂.₅ were highly correlated with a fixed time-activity pattern compared with PM₁₀. The finding implied a high infiltration rate of PM₂.₅ and low infiltration rate of PM₁₀. The relationship between personal exposure and ambient concentrations of PM₁₀ and PM₂.₅ was different for high level episodes. In the Asian dust episode, staying indoors could reduce personal exposure to PM₁₀. However, personal exposure to PM₂.₅ could not be reduced by staying indoors during the fine dust advisory episode.
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