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Updated: Feb 12, 2026

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Published on: March 18, 2019
Different relationships between personal exposure and ambient concentration by particle size
Sooyoung Guak1, Kiyoung Lee2,3
1Department of Environmental Health Sciences, Graduate School of Public Health, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul, 08826, Republic of Korea.
Personal exposure to fine particulate matter (PM2.5) closely mirrors ambient levels, unlike coarser PM10. Indoor air quality monitoring is crucial for understanding personal exposure to PM2.5 during pollution events.
Area of Science:
- Environmental Health
- Air Quality Monitoring
- Epidemiology
Background:
- Ambient particulate matter (PM) concentrations are often used to estimate population exposure in epidemiological studies.
- Diverse time-activity patterns significantly influence the correlation between personal exposure and ambient PM concentrations.
Purpose of the Study:
- To determine the relationship between personal exposure and ambient concentrations of PM10 and PM2.5.
- To minimize the impact of time-activity patterns on personal exposure measurements.
Main Methods:
- Evaluated the performance of the MicroPEM, v3.2 by collocated measurements with central ambient air monitors for PM10 and PM2.5.
- Conducted 24-hour personal exposure measurements over 26 days with a fixed office worker time-activity pattern in Seoul, Korea.
Main Results:
- The MicroPEM showed good linearity when compared to ambient air monitors.
- Personal exposure to PM2.5 was highly correlated with ambient concentrations under a fixed time-activity pattern, suggesting a high infiltration rate.
- PM2.5 personal exposure could not be reduced by staying indoors during fine dust advisory episodes, unlike PM10 during Asian dust events.
Conclusions:
- PM2.5 exhibits a higher infiltration rate into personal environments compared to PM10.
- Understanding personal exposure dynamics is critical, especially during high pollution episodes, as indoor environments may not fully mitigate exposure to fine particles.
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