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Clean Harbors Commences Trading on the New York Stock Exchange Under the Ticker Symbol “CLH”

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CEO Alan McKim Rings Opening Bell to Celebrate First Day of Trading

Norwell, MA – December 15, 2008 – Clean Harbors, Inc. (“Clean Harbors”) (NYSE: CLH), the leading provider of environmental and hazardous waste management services throughout North America, today announced that it has begun trading on the NYSE under the ticker symbol “CLH.” This completes the Company’s transition from The NASDAQ Global Select Market where it traded under symbol “CLHB.”

Alan S. McKim, Chairman and Chief Executive Officer, and Executive Vice President and Chief Financial Officer James M. Rutledge, together with several Clean Harbors employees, commemorated the Company’s transfer to the NYSE by ringing today’s Opening Bell.

About Clean Harbors

Clean Harbors is North America's leading provider of environmental and hazardous waste management services. With an unmatched infrastructure of waste management facilities, Clean Harbors serves over 47,000 customers, including more than 325 Fortune 500 companies, thousands of smaller private entities and numerous federal, state and local governmental agencies. Clean Harbors’ Technical Services provides a broad range of hazardous material management and disposal services including hazardous and non-hazardous waste recycling, treatment and disposal, CleanPack® laboratory chemical packing, and household hazardous waste management services. Clean Harbors’ Site Services provides field services, industrial services, vacuum services, emergency response and disaster recovery, transformer services, tank cleaning and decontamination.

Headquartered in Norwell, Massachusetts, Clean Harbors has more than 100 locations strategically positioned throughout North America in 36 U.S. states, six Canadian provinces, Mexico and Puerto Rico. For more information, visit


Investor Relations
Clean Harbors, Inc.
Jim Buckley
Executive Vice President
Sharon Merrill Associates, Inc.

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