!!!Saurer Regen

Acid rain, one of the most crucial environmental problems in many 
parts of Europe; a constant drop in the pH levels of precipitation has 
been registered since the sixties. Along with other factors, acid 
rain, has been responsible for damage to forests throughout Europe ( 
Forest Dieback). Air pollutants, in particular sulphur dioxide 
(SO<sub>2</sub>) and nitrogen oxide, are the chief causes of acid 
rain. Along with pollutants deposited by dry air and fog, acid rain 
damages vegetation and historic buildings, and chemically alters soil 
composition. As air exchange takes place irrespective of national 
borders, international agreements aimed at combating acid rain are 
necessary. Although Austria reduced its SO<sub>2 </sub>emissions by 
over 80&nbsp;% between 1980-1994, no improvement has yet been 
registered.


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