Clean Harbors to Announce Fourth-Quarter 2010 Financial Results on February 23

Norwell, MA – February 10, 2011 – Clean Harbors, Inc. (NYSE: CLH), the leading provider of environmental and energy and industrial services throughout North America, will host its fourth-quarter and full-year 2010 conference call on Wednesday, February 23, 2011 at 9:00 a.m. ET.

On the call, Chairman, President and Chief Executive Officer Alan S. McKim and Executive Vice President and Chief Financial Officer James M. Rutledge will discuss Clean Harbors’ financial results, business outlook and growth strategy.

Those who wish to listen to the fourth-quarter 2010 conference call webcast should visit the Investor Relations section of the Company’s website at www.cleanharbors.com. The live call also can be accessed by dialing 201.689.8881 or 877.709.8155 prior to the start of the call. If you are unable to listen to the live call, the webcast will be archived on the Company’s website.

About Clean Harbors

Clean Harbors is the leading provider of environmental and energy and industrial services throughout North America. The Company serves over 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, Singapore, Sweden, Thailand and the United Kingdom. For more information, visit www.cleanharbors.com.

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