When selecting outdoor seating for regions prone to acid rain, durability and resistance to corrosion are critical. Acid rain can accelerate wear and tear, so choosing the right materials ensures longevity and minimal maintenance. Here are the top options:

1. Stainless Steel: Highly resistant to rust and corrosion, especially grades like 316 marine-grade stainless steel, which withstands harsh weather conditions.

2. Powder-Coated Aluminum: Lightweight yet sturdy, aluminum with a powder-coated finish provides an extra layer of protection against acid rain.

3. Teak Wood: Naturally resistant to moisture and decay, teak is a premium choice for outdoor furniture, though it requires occasional sealing.

4. Polyethylene (PE) Rattan: Synthetic wicker made from PE is UV-resistant and unaffected by acid rain, making it ideal for outdoor use.

5. Concrete with Sealant: While heavy, sealed concrete benches or tables are highly durable and resistant to acidic damage.

For added protection, consider furniture with removable cushions made from water-resistant fabrics like Sunbrella. Regular cleaning and occasional treatments (e.g., teak oil or sealants) can further extend the lifespan of your outdoor seating in acid rain-prone areas.