TIL my garage gun shop needed better air flow fast

I turned part of my garage into a work area for cleaning and fixing guns. It seemed fine at first with just the door open. After a few weeks, I could taste metal in the air when sanding. My eyes would water from the cleaner fumes. I started getting headaches that lasted hours after I finished. A buddy who does this for a living asked about my ventilation. He told me that stale air lets all sorts of bad stuff pile up. I bought a simple box fan and a good filter to pull air out. It made a huge difference right away.