*(all) set. (to do something) prepared or ready to do something. (*Typically: be ~; get ~.) Are you set to cook the steaks? Yes, the fire is ready, and I'm all set to start.
How long will the odor last from our newly installed cellulose insulation? The odor is kinda of like a mild ammonia smell and is only noticeable when we're running the a/c.
Ozone smells like old copymachines and trafostations. Metallic smell of the skin (or pennies) comes from peroxides that forms from fattyacids on the skin and it is catalysed from touching metal. I think the outside smell that is described, also forms when you just open the door or window.