Acid rain can significantly damage outdoor furniture, making it essential to choose materials that withstand its corrosive effects. Here are the best options for durable and long-lasting outdoor seating in acid rain-prone areas:

1. Aluminum: Lightweight and naturally resistant to rust, aluminum is an excellent choice. Powder-coated aluminum offers extra protection against acid rain.

2. Stainless Steel: Highly corrosion-resistant, especially grades like 316 marine stainless steel, which can endure harsh weather conditions.

3. Teak Wood: Naturally resistant to moisture and decay, teak requires minimal maintenance and ages beautifully even in acidic environments.

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

5. Concrete with Sealant: While porous, sealed concrete resists acid rain damage and provides a sturdy, modern look for outdoor seating.

For added longevity, opt for furniture with protective coatings and avoid materials like untreated iron or low-quality plastics. Regular cleaning and maintenance will further extend the life of your outdoor seating in acid rain regions.