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What are the effects of sulfur dioxide pollution on stone pots?
Sulfur dioxide (SO₂) pollution poses a significant threat to stone pots, particularly those made of limestone, marble, or other calcareous materials. When SO₂ reacts with moisture in the air, it forms sulfuric acid, which accelerates chemical weathering. This acidic reaction dissolves the calcium carbonate in stone, leading to surface erosion, pitting, and loss of structural integrity over time.
In urban or industrial areas with high SO₂ levels, stone pots may develop a powdery residue or discoloration, signaling deterioration. Additionally, repeated exposure weakens the material, making it more susceptible to cracking and breakage.
To mitigate these effects, regular cleaning with pH-neutral solutions and applying protective sealants can help. Moving stone pots to sheltered areas or using SO₂-absorbing plants nearby may also reduce damage. Understanding these risks is crucial for preserving antique or decorative stone pots in polluted environments.
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