Material is anything which consists of one or more substances which are intentionally used to form another material or final product.
Examples for material are
- sand, cement
- wood, nails, screws, glue
So dust, pollution which is also added unintentionally to most products is not a material.
The definition can vary by the intended use.
For example: For nail-makers the nails are their products, while for a furniture maker the nails are material.