Calgon Carbon Announces Newest Odor Control System

Pittsburgh, PA — May 20, 2002 — Calgon Carbon Corporation announced today the introduction of its latest municipal odor control product, Phoenix XT™.

Calgon Carbon Corporation has been a provider of odor control products to municipalities and industries around the world for over thirty years. Wastewater treatment facility processes often produce odorous emissions that must be controlled. These emissions usually consist of hydrogen sulfide and various organic sulfide compounds. These odorous compounds constitute a nuisance to the surrounding neighborhoods and businesses.

Phoenix XT™ is an evolutionary product that combines Calgon Carbon's patented Phoenix™ system with its unique Titan™ system. The combination of these two activated carbon systems creates an integrated package that can effectively control virtually any municipal wastewater odor problem. Phoenix XT™ can treat odorous airflow rates between 3,000 — 30,000 cubic feet per minute.

Compared to alternative technologies, such as multi-stage chemical scrubbers and biofilters, Phoenix XT™ provides more effective odor removal in a package that takes up less space. Phoenix XT™ is designed to remove 99.9% of all odorous compounds. Most importantly, Phoenix XT's combined purchase and maintenance costs are less than any of the equivalent competitive products.

Commenting on the Phoenix XT™, Charles Fluharty, director of marketing of Calgon Carbon Corporation's Engineered Solution Group, said, "Phoenix XT is an example of our ability to integrate our technologies to provide solutions to difficult odor emission problems faced by municipalities around the world."

Assessing Purification, Separation, Recovery and Synthesis Needs
Calgon Carbon Corporation provides Engineered Solutions to customers' air, water and chemical process problems through design, fabrication and operation of systems that utilize a combination of core technologies: ion exchange and chromatographic separations, ultraviolet light disinfections and oxidation, odor control, solvent recovery, VOC abatement and distillation.

The group includes 160 professional engineers, scientists, sales and marketing personnel, four global manufacturing sites, intellectual property assets of more than 50 patents as well as pilot plant facilities and custom chemical manufacturing capabilities utilizing our technology.

About Calgon Carbon Corporation
Calgon Carbon Corporation is a global leader in services and solutions for making air and water safer and cleaner, and for purifying food, beverage, and industrial process streams.

Headquartered in Pittsburgh, Calgon Carbon Corporation employs approximately 1,000 people and serves more than 4,000 customers around the world through four business platforms: Carbon, Service, Engineered Solutions and Consumer Health.

Calgon Carbon offers a variety of technology solutions and services to address all purification, separation, recovery and synthesis needs.

For more information, visit the Calgon Carbon website at: www.calgoncarbon.com or contact a customer service technician at: info@calgoncarbon.com or call 1-800-422-7266.

Contact: Gail Gerono, Director of Investor Relations and Corporate Communications, (412) 787-6795; gerono@calgoncarbon.com