Clean Harbors to Present at the Bank of America Merrill Lynch 2009 Global Industries Conference on December 8

Norwell, MA – December 1, 2009 – Clean Harbors, Inc. (“Clean Harbors”) (NYSE: CLH), a leading provider of environmental, energy and industrial services throughout North America, today announced that Chairman and Chief Executive Officer, Alan S. McKim will be presenting at the Bank of America Merrill Lynch 2009 Global Industries Conference. The conference is being held December 8-10, 2009 in New York City.

Clean Harbors’ presentation will take place at 2:30 p.m. (ET) on Tuesday, December 8, 2009 and will be webcast live. To access the live or archived webcast, visit the “Investor Relations” portion of Clean Harbors’ website at www.cleanharbors.com.

About Clean Harbors

Clean Harbors is a leading provider of environmental, 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.

Within Clean Harbors Environmental Services, the Company offers Technical Services and Field Services. Technical Services provide a broad range of hazardous material management and disposal services including the collection, packaging, recycling, treatment and disposal of hazardous and non-hazardous waste. Field Services provide a wide variety of environmental cleanup services on customer sites or other locations on a scheduled or emergency response basis.

Within Clean Harbors Energy and Industrial Services, the Company offers Industrial Services and Exploration Services. Industrial Services provide industrial and specialty services, such as high-pressure and chemical cleaning, catalyst handling, decoking, material processing and industrial lodging services to refineries, chemical plants, pulp and paper mills, and other industrial facilities. Exploration Services provide exploration and directional boring services to the energy sector serving oil and gas exploration, production, and power generation.

Headquartered in Norwell, Massachusetts, Clean Harbors has more than 175 locations, including over 50 waste management facilities, throughout North America in 37 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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