Metal sculptures undergo distinct aging processes depending on whether they're displayed in urban or rural settings. In cities, sculptures face accelerated corrosion due to acid rain, industrial pollution, and road salts. These contaminants create pitted surfaces and unstable patinas, often requiring frequent maintenance. The Statue of Liberty's green verdigris, for instance, formed faster than natural patination due to urban atmospheric chemistry.

Rural environments offer gentler but more varied weathering. Natural patinas develop slowly through exposure to rainwater, humidity, and organic matter. Copper sculptures develop richer blue-green hues, while iron acquires reddish-brown rust. However, agricultural chemicals and bird droppings can cause unexpected corrosion patterns.

Humidity plays a dual role - coastal rural areas cause rapid salt corrosion resembling urban damage, while dry climates preserve details longer. Temperature fluctuations in both environments cause expansion/contraction stress. Urban heat islands may accelerate this thermal fatigue.

Modern alloys and protective coatings help mitigate environmental impacts, but many artists intentionally incorporate weathering into their designs. Understanding these aging patterns helps conservators choose optimal locations and preservation methods for outdoor metal artworks.