It is important to note that an airbrush should be used in a well ventilated area (for instance outside, in a garage or in a well ventilated studio) and that you, the user, wear a breathing mask when using and operating an airbrush. Fine paint particles when inhaled can harm or kill you, so cover up.
For quite some time I have wanted to purchase an airbrush and now I'm finally going to take the plunge. Having little to no prior first-hand experience with this tool, I started with the fundamentals: What does an airbrush do? I found a great starting place to be the Airbrush Wiki. After pushing through the fundamentals, I quickly discovered there were three airbrush characteristics that are very important to consider when purchasing an airbrush. They are;