I was just cleaning up my painting room a bit and realized that I needed to change the filter on my airbrush booth. I use a small portable booth that isn't as powerful as some of the others I've tried in the past but it's been great for storage. Considering it's slightly under powered, I also use a nice respirator mask that filters out things like spray paint vapors. Almost all of the paints that I use are labeled as "non-toxic" but the filter below is a great example of why you should always protect your breathing when you airbrush; even if you're using Acrylic paints that you might think are innocuous.
Here's a close up... the first thing my wife said when I showed her the used filter was "imagine that stuff collecting in your lungs". Airbrush booths can be a little pricey (even my cheap portable one was over $100); but in my opinion they are more than worth the price. At the very least, you should always be sure you're using a respirator.
Just a few hobby thoughts... happy painting.