Why are rust and oxidation common in Lima?

Rust and oxidation are common in Lima primarily due to the city's high levels of humidity.1

The city's climate is characterized by a dense sea mist known as garúa, which blankets the area throughout the winter months. This persistent dampness, combined with the city's tendency to trap airborne pollutants under thick cloud cover, creates an environment that accelerates the oxidation process. Consequently, rust is a frequent and visible issue for structures and materials throughout the capital.1