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What is the best way to help you decide what type of air purifer to purchase?

You should look at air purifier ratings to help you decide on what type to buy and when doing so these can give you a good idea of certain features that are available on certain brands. 

If they have a high rating, then it may be one you should look into buying because it may benefit you greater as far as your health is concerned.  Try to find one that has a good rating and you will be glad you did when you start using it.