It is advised that industries around the Taj Mahal should switch over to cleaner fuels such as CNG and LPG because pollutants in the air are discoloring the white marble of the Taj Mahal.
This discoloration is known as marble cancer. Sulphur dioxide and nitrogen dioxide gases being released by industries are causing acid rains. Acid rain dissolves the marble of the Taj Mahal.
If the beauty of the Taj Mahal fades, it would be a cause for concern on a national scale.
CNG and LPG are eco-friendly and cause no harm to the environment.