The air inside smelled faintly metallic and stale.

The sea breeze smelled faintly metallic.

The air smells metallic, minerals flushed from rocks.

For example, rain water that has collected from drainage pipes or barrels always seem to smell metallic to me.

The floor was packed dirt, and the air was close, smelling metallic.

The air inside the exo smelled metallic, burnt, as though the suit was brand new and still outgassing.

The room smelled stale and metallic.

They had arrived in Siena when the recently washed streets smelled fresh and metallic.

The air smelled stale and metallic.

The air smelled metallic with chemicals and disinfectants, a scrubbed, sterile environment.