I’m interested to know, because we live near the beach and all the metal on the outside of our house is corroded.
My dad says it was from the wind picking up spray from the surf, but I’m not so sure.
Listen to your father ! Yes droplets of spray are carried on the wind several miles . There are any number of corrosion tables listing atmospheric corrosion more severe on sea coasts. Much of the testing was / is being done at Kure Beach ( N or S ) Carolina.