Clean Harbors Invites Public to Listen to Live Investor Day Webcast on September 16, 2010

Norwell, MA – August 26, 2010 – Clean Harbors, Inc. (NYSE: CLH), the leading provider of environmental, energy and industrial services and hazardous waste management services throughout North America, today announced that it will provide a live webcast of its Investor Day on Thursday, September 16, 2010, from approximately 8:30 a.m. to 12:30 p.m. (EDT).

All interested parties are invited to listen as Chairman and Chief Executive Officer Alan S. McKim, Chief Financial Officer James M. Rutledge and four additional members of the executive management team provide an overview of the Company’s businesses, growth strategy and industry outlook through a series of presentations, followed by a question-and-answer session. The live webcast can be accessed in the Investor Relations section of the Company’s website at www.cleanharbors.com. For those unable to listen to the live presentations, the event will be archived and available on the Company’s website.

About Clean Harbors

Clean Harbors is the leading provider of environmental, energy and industrial services and hazardous waste management services throughout North America. The Company serves more than 50,000 customers, including a majority of the Fortune 500 companies, thousands of smaller private entities and numerous federal, state, provincial and local governmental agencies.

Headquartered in Norwell, Massachusetts, Clean Harbors has more than 175 locations, including over 50 waste management facilities, throughout North America in 36 U.S. states, seven Canadian provinces, Mexico and Puerto Rico. The Company also operates international locations in Bulgaria, China, Sweden, Singapore, Thailand and the United Kingdom. For more information, visit www.cleanharbors.com.

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