Variability of PM10 concentrations dependent on meteorological conditions

The influence of atmospheric exchange conditions on near surface PM10 concentrations is analysed for four cities in the South-West-Germany in the period 2001 to 2005. For each city, the PM10 data originates from roadside stations and Urban Background (UB) stations, that is, two types of official urban air quality monitioring stations characterised by different emission sitations. The atmospheric exchange conditions are represented by solar radations, air temperature, wind speed, mixing-layer height, precipation and backward-trajectories. The results of the statistical analysis indicate that precipation and mixing-layer height are the meteorological variables influencing near-surface PM10 concentrations most significant within cities. The absence of precipation and low values of the mixing-layer height lead to comparatively high PM10 levels, particularly in winter.