Bronze sculptures, renowned for their durability and timeless beauty, face unique challenges in environments with high nitrogen oxide (NOx) levels. Nitrogen oxides, common in urban and industrial areas, react with moisture to form nitric acid, which can accelerate corrosion. However, bronze's natural patina—a protective layer of copper carbonate—often shields the metal from severe damage. Over time, this patina may darken or develop a greenish hue, altering the sculpture's appearance but not necessarily compromising its structural integrity.

To mitigate NOx-related corrosion, regular maintenance is essential. Cleaning with mild, non-abrasive solutions and applying protective wax coatings can help preserve the sculpture's surface. Additionally, placing sculptures in sheltered locations or using air filtration systems in indoor exhibits can reduce exposure.

Art conservators emphasize that while bronze is more resistant to NOx than other metals, prolonged exposure in highly polluted areas may require professional restoration. Understanding these dynamics ensures the longevity of bronze artworks, even in challenging environments.