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ATMOSPHERIC POLLUTION & ACID RAIN<br />
Metropolitan Life Building, NYC<br />
SO2 (sulfuric dioxide) combines with atmospheric moisture (H20), yielding acid rain, or sulfuric acid (H2SO4).  Calcium carbonate in limestone statuary dilutes the sulfuric acid to form calcium sulfate, corroding the stone.

Fphoto-14788901A-3DS.jpg

ATMOSPHERIC POLLUTION & ACID RAIN
Metropolitan Life Building, NYC
SO2 (sulfuric dioxide) combines with atmospheric moisture (H20), yielding acid rain, or sulfuric acid (H2SO4). Calcium carbonate in limestone statuary dilutes the sulfuric acid to form calcium sulfate, corroding the stone.

Copyright:© 1989 Diane Hirsch - Fundamental Photographs

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Diane Hirsch