1. Deterioration: Pollution is one of the major challenges for heritage structures as it leads to rapid deterioration of the building materials and finishes.
2. Discoloration: Pollution can cause the discoloration of the heritage structures, including stained glass, metalwork, and sculptures.
3. Corrosion: Corrosion caused by pollution can result in the weakening of structural components such as support beams, trusses, and ties, which can be dangerous for the preservation of heritage architecture.
4. Cleaning: Pollution makes cleaning a major challenge, and several traditional cleaning methods cannot be used on heritage buildings as it can cause further damage.
5. Restoration cost: Pollution can increase the cost of restoration as it requires specialized knowledge and expertise. It also adds to the costs associated with maintenance and repairs.
6. Acid-rain: Acid-rain caused by pollution can cause significant damage to heritage buildings as it leads to corrosion, pitting, and general deterioration of building materials.
7. Weathering: Pollution affects the weathering of the building materials, making them more susceptible to damage caused by extreme temperature fluctuations.
8. Lack of awareness: Lack of awareness and understanding among the general public and the authorities about the importance of the conservation of heritage architecture often leads to neglect and destruction of these significant structures.
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