From 18th century acid rain has been observed in many places of world industrial emissions are above pollution level. Chemical chemical precursors of sulfuric and nitric acids combine with natural sources of acidic particles results acid rain. Precursors are nitrogen oxide (NOx) and sulfur dioxide (SO2). Acidic particles are from volcanoes and decaying vegetation. This mixture when reacts with oxygen, water and other chemicals the acid carried to soil and groundwater through rain snow, frost and mist.
The scenario of USA are- 2/3 of all SO2 and 1/4 of the NOx emissions
in the atmosphere are generated from coals that burn in power plants
and agricultural and vehicular equipment that use gasoline as fuel. It
can be said that some wear on building structures in industrialized
regions might be occurred due to acid rain. But in some arid regions
where dry depositions containing acidic pollutants, forms on buildings
can suffer more sticking.
In
this arid regions when rain or snow falls, subsequent wet deposition of
nitric and sulfuric acids becomes more acidic. These acidic components
than wash into soil and subsequently recharge aquifers.
streaking and discolorization of bridges and commercial or industrial metal buildings have been observed from many years due to impact of acid rain. This is due to corrosion of bronze, zinc, nickel, carbon-steel and copper.
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