7 Environmental Impacts of Tourism on Lakes
87
mainly by gaseous emissions from fuel burning and exhausts
from cars. Depending on many factors, in particular the geology of the catchment, acidification by primary pollutants
(Fig. 7.4) or secondary pollutants produced in the atmosphere primarily decreases the pH values in streams, rivers
and lakes. As a consequence, a multitude of complex direct
and indirect effects occur in freshwater biological systems
(D’Itri 1982).
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Fig. 7.4 Relative proportion of gaseous primary pollutants and their
origin
Nitrogen oxides
15%
Volatile
organics
14%
Sulfur oxides
16%
Particulates
6%
Carbone
monoxide
49%
Transportation
46%
Fuel
combustion
27%
Industrial
processes
15%
Solid waste
disposal
3%
Miscellaneous
9%
Primary pollutants
Origin of
primary pollutants
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