Why rate of corrosion is more at Mumbai than Pune?

The rate of corrosion is higher in Mumbai than in Pune primarily due to Mumbai's coastal location, which exposes it to higher humidity and saline air from the Arabian Sea. This saline environment accelerates the oxidation processes that lead to corrosion. Additionally, urban factors such as pollution and industrial activity in Mumbai contribute to increased levels of corrosive agents in the atmosphere, further exacerbating the corrosion rate compared to the relatively inland and less humid environment of Pune.