Abstract
The monoterpenes and the major organic volatile pollution products of forest air were quantitatively analyzed by mass spectrometric single ion monitoring. The monoterpenes present in measurable amounts were tricyclene, α-pinene, β-pinene, camphene, sabinene, myrcene Δ-3- carene , limonene, eucalyptol, camphor, bornyl acetate and terpinyl acetate. During the cold season low concentrations were observed, not exceeding a total of 62 ng/m 3 in March and 98 ng/m 3 in December. In late summer much larger concentrations, up to 946 ng/m 3, were found. As compared to the concentrations of the individual terpenes in the needles of Picea abies, the dominating tree species of the sampling site, changes in the proportions of these compounds in the air indicated that chemical reactions had occurred in the atmosphere. The concentrations of monoterpenes of the air were only faintly effected by the wind speed. In contrast, the pollution products were dramatically reduced at elevated wind speeds.
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