The most likely cause of the effect shown in the given photograph is Acid deposition.
What are the causes of Air pollution?
The causes of air pollution include excessive burning of fossil fuels, industrial emissions, carbon emissions from automobiles, construction and industrial wastes, etc.
Acid deposition may be also known as Acid rain. It includes the form of precipitation with several acidic components like nitric acid and sulfuric acid.
These precipitations finally falls on the earth from the atmosphere in the form of rain, snow, fog, etc., and are deposited on tall trees, buildings, and objects, and lose their natural beauty.
Therefore, the most likely cause of the effect shown in the given photograph is Acid deposition.
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