CLHB Clean Harbors (MM)

Clean Harbors, Inc. (�Clean Harbors�) (NASDAQ: CLHB), the leading provider of environmental and hazardous waste management services throughout North America, today announced that senior management will be presenting at the 5th Annual Wedbush Morgan Institutional Investor Conference. The conference is being held May 16 - 17 at the Le Parker Meridien Hotel in New York City. Clean Harbors� presentation will take place at 3:00 p.m. (ET) on Wednesday, May 16, 2007 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, Inc. Clean Harbors, Inc. is North America's leading provider of environmental and hazardous waste management services. With an unmatched infrastructure of 49 waste management facilities, including nine landfills, six incineration locations and six wastewater treatment centers, the Company provides essential services to over 45,000 customers, including more than 325 Fortune 500 companies, thousands of smaller private entities and numerous federal, state and local governmental agencies. 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 www.cleanharbors.com.