What are the best stone types for outdoor sofas in areas with heavy pollution?

When selecting stone for outdoor sofas in heavily polluted areas, durability and resistance to environmental damage are key. The best options include:

1. Granite: Highly resistant to pollution, scratches, and weathering. Its dense structure prevents staining and retains its appearance over time.

2. Basalt: Known for its toughness and low porosity, making it ideal for polluted urban environments.

3. Slate: Naturally resistant to chemicals and moisture, requiring minimal maintenance.

4. Quartzite: Offers excellent durability and a polished look, though it may need occasional sealing.

5. Concrete Composite Stone: Engineered for high resistance to pollution and extreme weather.

Choose stones with low porosity and seal them regularly to enhance longevity. Avoid softer stones like limestone or sandstone, as they degrade faster in polluted conditions. Prioritize materials that balance aesthetics with practicality for long-term outdoor use.