What is polystyrene?

Polystyrene, commonly referred to by its trade name as "Styrofoam," is a petroleum-based plastic derived from a styrene monomer. Because polystyrene is a lightweight material with insulation properties, it is commonly used to manufacture a variety of single-use disposable products, such as cups, takeout containers, and other food and beverage service ware.

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1. What is polystyrene?
2. What businesses are included in the ban?
3. Are there any exemptions from the ban?