Tag: air and water pollution control

In general, marbles that make palaces, other monuments and forms of architecture, limestone and natural sources of ammonia are severely affected by the action of oxides of sulphur($SO _2$).
The passage of $SO _2$ gas has caused the yellowing of Taj Mahal over these years.

The Taj Mahal has become a matter of concern because pollutants in air are discolouring its white marble. It is the most beautiful place in India and it will be a tragedy if something bad happens to it. 

Experts have warned that pollutants in the air are discolouring its white marble. So, it is not only living organisms that get affected by polluted air but non-living things like buildings, monuments and statues also get affected.

The Supreme Court ordered industries to switch to cleaner fuels like CNG (Compressed Natural Gas) and LPG (Liquefied Petroleum Gas). Moreover, the automobiles should switch over to unleaded petrol in the Taj zone.

Experts have warned about Taj Mahal that pollutants in air are discolouring its white marble.

Granite is the least susceptible to acid rain because its it is composed of feldspar and quartz, both of which resist attacks of acid.

Sulphur dioxide fumes mix with air moisture and come down as acid rain in the form of sulphuric acid. This acid rain can damage the marble tombs which is calcium carbonate and its reaction with acid rain forms calcium sulfate which gives a yellowish color of acid to the marble. This gradually destroys the marble structure over a period of time.
$CaCO _3 + H _2SO _4 \rightarrow CaSO _4 + H _2O + SO _2\uparrow$

$CO _2$ which is naturally occurring oxide dissolves in water and form carbonic acid and makes the normal rain water slightly acidic.

Acid rain corrodes the marble of the monument. The phenomenon is also called Marble cancer.