Metal sculptures are a popular choice for outdoor art due to their durability and aesthetic appeal. However, exposure to acid rain and pollution can pose challenges to their longevity. The resistance of metal sculptures to these environmental factors largely depends on the type of metal used and protective measures applied.

Stainless steel and bronze are among the most resistant metals, offering natural corrosion protection. Stainless steel contains chromium, which forms a passive oxide layer that shields against acid rain. Bronze develops a patina over time, acting as a protective barrier. Aluminum is also highly resistant due to its oxide layer, making it suitable for polluted urban environments.

For metals like iron or mild steel, protective coatings such as powder coating, galvanization, or wax sealants are essential. Regular maintenance, including cleaning and reapplying protective layers, can significantly extend the lifespan of metal sculptures in harsh conditions.

Artists and collectors should consider local climate and pollution levels when selecting materials. Proper placement, such as under shelters or in less exposed areas, can further reduce damage. By choosing the right metal and implementing protective strategies, metal sculptures can endure acid rain and pollution while retaining their artistic integrity for decades.