How does limestone help protect soil and water from acid rain?

Limestone helps protect soil and water from the effects of acid rain primarily through the process of liming, which utilizes the chemical properties of calcium carbonate to neutralize acidity.1

In agricultural and environmental management, ground limestone is applied to soil to counteract the acidifying effects of rainfall, which often leaches essential nutrients like calcium and magnesium from the earth. By reacting with the soil, the calcium carbonate reduces overall acidity, effectively acting as a buffer that helps maintain a more stable pH balance. This process is crucial because acid rain can deplete natural soil buffers, leading to nutrient loss and the release of toxic dissolved aluminum into the environment.12

While limestone is a vital tool for buffering acidity in soil and water, it is important to note that limestone itself is susceptible to damage from acid rain. When exposed directly to sulfur dioxide and acidic precipitation, limestone can dissolve or react to form gypsum, which leads to the deterioration of natural landscapes and human-made structures.23