In
Torrelavega there have been cases of acid rain, caused by factory emissions
from Sniace and Solvay (http://www.eldiariomontanes.es/pg060630/prensa/noticias/Torrelavega/200606/30/DMO-TOR-046.html). Acid rain is formed when the
moisture in the air combines with the nitrogen oxides and sulfur dioxide
emitted from factories, power plants and vehicles that burn coal or petroleum
products.
There have
been many complaints against these factories, which has forced them to put some
special filters to clean their emissions. The number of cases of acid rain has
fallen considerably since these filters have been installed, but there is still
some acid rain. The problem has not been completely solved.
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