Koppers Holdings Inc.

Pittsburgh, Pennsylvania, USA, 10 July 2007 -- /PRNewswire/ -- Koppers Holdings Inc. (NYSE: KOP) intends to release its second quarter 2007 financial results before the opening of the markets on 09 August 2007, and to discuss its results on a conference call later that day at 11:00 a.m. Eastern Daylight Time.

Interested parties may access the live audio broadcast by dialing (888) 810-0248 (USA/Canada) or +1 (706) 643-9697 (international) and entering Conference ID number 6801828. Investors are requested to access the call at least five minutes before the scheduled start time to complete a brief registration. An audio replay will be available approximately two hours after the completion of the call at (800) 642-1687 or +1 (706) 645-9291, Conference ID number 6801828. The recording will be available for replay through 23 August 2007.

The live broadcast of Koppers' conference call will be available online at http://phx.corporate-ir.net/phoenix.zhtml?p=irol- eventDetails&c=194019&eventID=1598869. (Due to the length of this URL, it may be necessary to copy and paste this hyperlink into your Internet browser's URL address field.)

If you are unable to participate during the live webcast, the call will be archived on www.koppers.com, www.streetevents.com and www.earnings.com, shortly after the live call and continuing through 23 August 2007.

About Koppers

Koppers, with corporate headquarters and a research center in Pittsburgh, Pennsylvania, is a global integrated producer of carbon compounds and treated wood products. Including its joint ventures, Koppers operates facilities in the United States, United Kingdom, Denmark, Australia, and China. The stock of Koppers Holdings Inc. is publicly traded on the New York Stock Exchange under the symbol "KOP". For more information, visit www.koppers.com. Questions concerning investor relations should be directed to Brian H. McCurrie at 412 227 2153 or Michael W. Snyder at 412 227 2131.

Source: Koppers Holdings Inc.