definiens: means any material, chemical, compound, substance, mixture, waste or by - product ( regardless ofphysical form or concentration ) that ( a ) is hazardous, toxic, infectious, explosive, radioactive, carcinogenic, ignitable, corrosive, reactive, or otherwise harmful to living things or the environment, ( b ) is or becomes identified, defined, designated, listed, restricted or otherwise regulated under Environmental Laws, or ( c ) could pose a hazard to the environment or the healthand safety of any Person or impair the use or value of any portion of the Real Estate or any other property . The term shall include without limitation pollutants, contaminants, pesticides, biological agents, biohazardousmaterials, etiologic agents, petroleum, petroleum products and by - products, radioactive substances, solid wastes, hazardouswastes, hazardous substances, extremely hazardous, special, dangerous or toxic wastes, substances, chemicals or materialswithin the meaning of any Environmental Law, including any as defined, listed, designated orregulated under the Comprehensive Environmental Response, Compensation and Liability Act of 1980, 42 U.S.C