environmentally hazardous substances "environmentally hazardous substances" means any natural or artificial substances including any raw material, whether in a solid, semi-solid or liquid form, or in the form of a gas or vapour, or in a mixture of at least two of these substances, or any living organism intended for environmental protection, conservation and control activity, which can cause pollution; [Ins. Act A953] ACT 127 - ENVIRONMENTAL QUALITY ACT 1974 2. Interpretation.