Indoor air quality is just as important as outdoor, so it's good to be able to test the quality of your home's indoor air. Depending on what kind of testing you want to do, there are different ways you can go about it. If you want a fast and easy way to test, try some quick color reactions! If you're more interested in understanding what exactly the chemicals in your home are, then going with gas chromatography would be a better option for you. Some general things related to ASTM standards that can maybe help get you started on picking out a method of testing that will work best for your needs.