This would mostly be an issue with magnetized iron sheets and girders within buildings, but since all metals are immersed in Earth's magnetic field, all iron objects are magnetized to some degree.
(This; would mostly be; an issue with magnetized iron sheets and girders within buildings) (all metals; are immersed; in Earth's magnetic field) (all iron objects; are magnetized; )
This all metals all iron objects
would mostly be are immersed are magnetized
an issue with magnetized iron sheets and girders within buildings
in Earth's magnetic field