Abstract
Mass concentrations of ambient particulate matter were measured in terms of daily average values of PM1, PM2.5, and PM10 for 6 months during the winter of 1996−1997 at a fixed sampling site in Helsinki, Finland, along with meteorological parameters and particle number concentra tions in the size range 0.01−1 μm. In addition, the PM filters were subjected to reflectometric analysis to determine absorption coefficients for the various fractions of urban particulate matter. The data were divided into two periods (winter and spring) in order to study more closely seasonal phenomena that have an effect on air pollution patterns. The variations in PM10 and PM2.5 concentrations differed in pattern during resuspended dust episodes, whereas those in PM1 concentrations followed those in PM2.5 fairly well throughout the 6-month measurement period. Thus it seems that PM1 does not provide much additional information on mass concentrations relative to PM2.5. Number concentrations in the ultrafine particle size range fr...
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