Abstract
The work described is primarily a methodological experiment of applying dendrochronology to determine the effect of air pollution on the radial growth of Pines within a distance of 0–1·5 km from a chemical installation producing fertilizers (Typpi Oy). This plant has been functioning for about 20 years, discharging fertilizer dust and certain toxins—mainly fluorine compounds. The diametric growth of Pines clearly varies in correlation with the functioning of the chemical plant. Younger trees (under 50 years old), in particular, are responsive to the action of the fertilizer dust. The harmful effects appear later, and can be seen even in fairly old trees (under 100 years old). The variation in radial growth can be regarded as a biological parameter that is significant in elucidating the effects of pollution in the coniferous zone and in predicting future development.
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