By M. H. Unsworth

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1 Location of the experimental sites of the national monitoring network for effects of air pollution on plants in the Netherlands during 1978. The numbers refer to regional codes materials are the same at all 40 experimental fields and these fields are visited weekly in the monitoring period, but not all on the same day. This restriction should be taken into account when comparing the results of the concentration measurements and the biological-effect measurements re­ sulting from exposures for one week.

It could be a worthwhile source of information to have an extensive biological-effects monitoring network spread over Western European countries to show the distribution, according to place and time, of specific effects of air pollution on plants. In every case, the selection of plants and conditions should be adapted to the specific aim of the study. When the pollutant to be studied is known, 32 Biological indicators of air pollution selection of specific sensitive indicator plants is the first step towards adequate results.

Their principal rate constant for flux density to a leaf can be shown to be vg/V where vg is the deposition velocity and V is the chamber volume. Inherently an analysis which yields a 'constant' depending on chamber dimensions seems undesirable. M. H. Unsworth 47 CANOPIES Monteith (1963, 1965) extended the resistance analogies for single leaves to apply to analysis of evaporation and C0 2 exchange from canopies of field crops. Fowler and Unsworth (1974, 1979) used the same approach to analyse S0 2 fluxes to wheat, and similar analyses for ozone have been reported by Wesely et al.

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