How can acid rain damage lakes, forests, buildings, and monuments?

Acid rain, primarily caused by the emission of sulfur dioxide and nitrogen oxides from fossil-fuel combustion, damages the environment and human-made structures through several chemical processes.123

Impact on Lakes and Forests

• Lakes: Acid deposition lowers the pH of freshwater systems, particularly those with low buffering capacity. This acidification releases toxic aluminum from soils into the water, which damages fish gills and impairs respiration. Furthermore, high acidity can accelerate the conversion of mercury into methyl mercury, a potent neurological toxin that bioaccumulates in the food chain.134
• Forests: Acid rain alters soil chemistry by leaching essential plant nutrients like calcium and magnesium. The resulting nutrient deficiency, combined with the presence of toxic aluminum, weakens trees, making them more susceptible to drought, pests, and extreme cold.53

Impact on Buildings and Monuments

Acid rain is highly corrosive to materials such as limestone and marble. Sulfur dioxide reacts with these materials in the presence of water to form gypsum, which eventually dissolves or flakes off, leading to the deterioration of historic structures and monuments.63