We open all the doors and windows!
Most of the time cutting almost any kind of metal will not smell at all. If you are getting foul odors or smoke look at your cutting fluids first. If they are dirty or rancid that is your problem. Clean coolents don't smell bad. Also if you have a job that is making alot of smoke you can get a "Smog Hog" or something like it to filter out the smoke. Goodluck!