《Table 1–Descriptive statistics for hourly personal exposure to PM2.5and BC (all values are inμg m-3

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《Exposure to air pollutants in Vietnam:Assessing potential risk for tourists》

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Average exposure to PM2.5and BC over a 24 hr period was18.9±9.24 and 3.41±1.33μg/m3respectively for the total sampling period.Across the three cities，the exposure concentrations for both PM2.5and BC were lowest in Nha Trang，and highest in HCM City（Table 1，Fig.3）.Peak exposures were observed in an indoor microenvironment with smoking in a residential setting in HCM City.