How does polypropylene outdoor seating resist discoloration from air pollution?

Polypropylene outdoor seating is highly resistant to discoloration caused by air pollution due to its unique material properties. This synthetic polymer is inherently non-porous, preventing pollutants and particulate matter from penetrating its surface. Additionally, polypropylene is often treated with UV stabilizers during manufacturing, which protect against fading from sunlight and chemical reactions with airborne contaminants. Its molecular structure is less reactive to acidic or alkaline pollutants, unlike natural materials like wood or metal. For enhanced durability, many polypropylene outdoor furniture pieces are also coated with protective layers that repel dirt and moisture, further reducing the risk of discoloration. Regular cleaning with mild soap and water can help maintain its appearance over time.