Carbon particles from fuel combustion, vehicle exhausts, trash burning , brick making are causes
A team of scientists led by Georgia Institute of Technology's Mike Bergin and Sacchichida Tripathi from the Indian Institute of Technology, Kanpur investigated the cause. They used scanning electron microscopy. Culprit >> Carbon Particles. Sources >> fuel combustion, vehicle exhausts, trash burning and brickmaking.----------------
"... the pristine white exterior of the Taj Mahal's famous dome and minarets started to sport a brown hue. Since the grit is not water soluble, every few years the structure now has to be cleaned by painstakingly applying and removing a layer of clay. ..."
"... researchers began by placing small pieces of pristine white marble at several locations around Taj Mahal's main dome for two months. ..."
"... contained particles of dust, brown organic carbon and black carbon. ..."
Refer http://www.dogonews.com/2015/1/23/scientists-identify-the-culprits-responsible-for-the-browning-of-indias-taj-mahal .
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