Abstract
Over a period of six months simultaneous suspended particulate matter measurements with two different high volume samplers, two different low volume samplers, an automated dichotomous particulate system and an integrating Nephelometer were carried out at the same semi-rural monitoring site in the vicinity of the Nuclear Energy Research Centre, Mol, Belgium. Except for the nephelometer all SPM-determinations were done gravimetrically. The entire experiment was based on the comparison of daily averages. A reasonable to good correlation was found between the different instruments although the daily levels as well as the overall statistics of the SPM-situation over a period of six months showed large deviations. For certain instruments the deviations seemed to be systematic. The experiment will be repeated over another period of six months in order to control the present findings.
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