When selecting a finish for metal sculptures in high-pollution areas, durability and resistance to environmental damage are paramount. The primary factors to consider include:

1. Corrosion Resistance: Opt for finishes like powder coating, epoxy, or galvanization that provide a robust barrier against acidic rain, industrial emissions, and salt spray.

2. UV Stability: High-quality acrylic or polyurethane coatings prevent fading and degradation from prolonged sun exposure.

3. Ease of Maintenance: Choose finishes that allow for simple cleaning and touch-ups, such as anodized aluminum or stainless steel with clear sealants.

4. Adhesion Strength: Ensure the finish bonds tightly to the metal substrate to prevent peeling or blistering in humid or polluted conditions.

5. Aesthetic Longevity: Matte or satin finishes often hide scratches and pollution buildup better than glossy alternatives.

By prioritizing these factors, artists and conservators can ensure metal sculptures remain visually striking and structurally sound despite harsh environmental challenges.