Investigations into the effects of acid rain on objects such as stone buildings, marble statues, metals, and paints only began in the 1990s. A joint study conducted by the EPA, the Brookhaven National Laboratory, and the Army Corps of Engineers in 1993 found that acid rain was causing $5 billion worth of damage annually in a seven-teen-state region. Two-thirds of the damage was created by pollution whose source was less than thirty miles away. Many of the country's historical monuments and buildings are located in eastern states that have been most hard-hit by acid rain.

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