ST. LOUIS (April 2, 2008) – Arch Coal, Inc. (NYSE:ACI) today announced that it has been named one of America's most trustworthy companies by Forbes magazine based on its sound accounting practices and financial reporting.

"Our selection as one of the most dependable and transparent U.S. companies makes us extremely proud," said Steven F. Leer, chairman and chief executive officer of Arch Coal. "We firmly believe that our sustained focus on integrity, transparency and corporate governance buoys investor and customer confidence and builds shareholder value."

The independent research firm, Audit Integrity, Inc., identified Arch Coal among the top 15 large-cap companies of 2008. More than 8,000 public corporations were considered for the Trustworthy 100 list. Arch was the only company listed from the U.S. coal industry.

Complete details behind the Most Trustworthy Companies in America can be found in the special report posted at www.forbes.com.

St. Louis-based Arch Coal is one of the nation's largest coal producers, with revenues of $2.4 billion in 2007. The company's core business is providing U.S. power generators with cleaner-burning, low-sulfur coal for electric generation. Through its subsidiary operations in Wyoming, Utah, Colorado, West Virginia, Virginia and Kentucky, Arch provides the fuel for approximately 6 percent of the electricity generated in the United States.