What you need to know about air purification and air filters is included in this very informative paper. Do you have too many choices for air purifiers, what exactly do they do to clean the indoor air you breathe? Not enough facts about the pros and cons, well after reading this paper you will have a much better knowledge of the air purification systems and air filters that are currently on the market. Don't be fooled by hyped up advertising. Making an informed decision about which air purifier system to purchase will depend on what you know and what your needs are. This very informative paper reviews air filters, what they actually capture, and what the different ratings really mean. The air purifier systems are also explained, along with each of their systems effectiveness on the air you breathe. A must read if you are even thinking about using or purchasing an air filter or air purifier system.