Annual average values for Elements (heavy metals)
The PM10 samples for the elemental analysis are collected with an automatic OPSIS SM200 sampler.
This sampler will occasionally contaminate the samples with Cr, Ni, Cu and Zn.
An "outlier filter" is included in the average calculations in order to reduce the influence
of the contamination. The average concentrations for Cr at urban background and rural stations are of
the same order as the average contamination. The Cr values are omitted for these stations.
Annual average values
Trends
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Updated 030527 K. Kemp