The peak F is situated in a recreational area where important
physical damage exists caused by holiday-makers. These special
conditions in the areas D, E and F hinder the investigation of
other pollution causes.
Finally, the peaks at G correspond with badly maintained orchards
near the settlement of Hoek.
Ghent, march 1978.
Acknowledgements : The authors wish to acknowledge the Dow
Chemical (Nederland) B.V., under whose auspices the research
for this study was performed, and Aero Survey p.v.b.a. (Belgium)
for the technical assistance.