Question

what do you mean by hazardous substances and wastes

Answer 1

Hey!!!...here is ur answer

Hazardous wastes can be liquids, solids, contained gases, or sludges. They can be by-products of manufacturing processes or simply discarded commercial products, like cleaning fluids or pesticides. 

Answer 2

Definition of Hazardous Waste:

One of the primary difficulties encountered by the government and industries engaged in hazardous waste control programs is to realistically define hazardous waste. Within different jurisdiction there have been multiply levels of sophistication in identifying hazardous waste.