SummaryAt De Bilt (52~ 05~ I'E) turbidity measurements were made according to Schiiepp's method during the period 1957-1971. A method was developed to eliminate the seasonal and air mass type effects from the turbidity parameters, the effect of especially the latter being appreciable. No trend in the new turbidity parameters could be detected. The effect of local pollution sources on the turbidity appeared to be only marginal.
SummaryA method is described to estimate the interception of direct solar radiation in the neighbourhood of a planned iron and steel plant by the expected dust emission from this plant. Only the total amount of this dust emission per unit of time was known.
ZusammenfassungDie Schw/ichung der direkten Sonnenstrahlung durch die erwartete Staubemission eines geplanten Eisen-und Stahlwerkes Es wird eine Methode zur Sch~itzung der Schw~ichung der direkten Sonnenstrahlung in der Umgebung eines geplanten Eisen-und Stahlwerkes durch die erwartete Staubemission des Werkes beschrieben. Von dieser Staubemission war nur der Gesamtbetrag pro Zeiteinheit bekannt.
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