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.