The white marble surfaces of the Taj Mahal have yellow stains from aging and pollution. The discoloration is caused by high levels of sulfur dioxide and nitrous oxide emitted by vehicles and the burning of fossil fuels. The treatment involves smearing the surface with a clay-based mud, allowing the mud to dry, and then washing the surface. Maintenance of all types of buildings is classed at 690.24 Maintenance and repair of buildings. The class-elsewhere note at 690.2 General activities of buildings indicates that maintenance of a specific type of building is classed with the type in 690.5-.8 Specific types of buildings, which is developed like 725-728 Architecture of specific types of structures. The Taj Mahal is a mausoleum, a kind of tomb. The architecture of tombs is classed at 726.8 Mortuary chapels and tombs. The note "Subdivisions are added for either or both topics in heading" at 726.8 indicates that standard subdivisions can be added for tombs. Because the maintenance is occurring in only one location, T1--093-099 Treatment by specific continents, countries, localities; extraterrestrial worlds is used instead of T1--0288 Maintenance and repair. (T1--0288 Maintenance and repair is below T1--093-099 Treatment by specific continents, countries, localities; extraterrestrial worlds in the table of preference at the beginning of Table 1.) The Taj Mahal is located in Agra, Uttar Pradesh, India. Because Agra does not have a specific notation, notation T2--542 Uttar Pradesh is used. Because Agra is not a class-here concept at T2--542, the notation 028 Conservation, preservation, restoration in the add table at T1--093-099, which can be added for Uttar Pradesh, cannot be added for Agra. While the maintenance of tombs in Uttar Pradesh is classed at 690.6809542028 Maintenance of tombs in Uttar Pradesh, India, the Taj Mahal's mud bath is classed at 690.6809542 Tombs in Uttar Pradesh, India.
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