Discussion
Which one of the following is responsible for turning Taj Mahal yellow?
Answer: B
The yellowing is caused by sulphur dioxide.
Sulphur dioxide from the Mathura refinery and other industries around Agra combines with moisture to form sulphuric acid, which falls as acid rain and corrodes the white marble (calcium carbonate). This 'marble cancer' discolours the monument, and to protect it the government set up the Taj Trapezium Zone with controls on polluting industries.
Nitrogen dioxide also contributes to acid rain, but sulphur dioxide is the pollutant the EVS and science textbooks name, while elemental sulphur and chlorine are not the cause.
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