Differences in PM10 concentrations measured by β-gauge monitor and hi-vol sampler

In this paper, differences between the 24-h average PM10 concentrations of Wedding β-gauge monitor and Andersen or Wedding hi-vol sampler were studied. When the deliquescent point is not exceeded, PM10 concentrations of the β-gauge are close to those of the manual samplers. The ratio of β-gauge PM10 to Andersen PM10 and Wedding PM10 is 1.08±0.06 and 1.09±0.12, respectively. However, when the deliquescent point is exceeded, water absorption by the inorganics of aerosols leads to higher PM10 concentrations of the β-gauge compared to those of the manual sampler. The ratio of β-gauge PM10 to Andersen PM10 and Wedding PM10 is 1.21±0.22 and 1.27±0.15, respectively. However, due to evaporation of water from the aerosols collected on the filter tape of the β-gauge, differences in PM10 concentrations are much less than theoretically calculated.