4 Reasons Why You Should Buy a Home Air Purifier. If you use the internet, read magazines, or watch television, there is a good chance that you have heard of air purifiers before. This is due in part to the fact that air purifiers have increased in popularity over the past few years. Despite the increase in popularity, you may be wondering if you really need to buy an air purifier. Even if you do not really need to have one, there are still a number of benefits to making a purchase....