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olansi.net, Choosing an Air Purifier: Purchase Guide Many people suffer from respiratory problems, usually derived from allergies and asthma. These reactions and diseases. Many people suffer from respiratory problems, usually derived from allergies and asthma. These reactions and diseases are usually caused by the environment: how it is, what load it carries, temperature, pollution, etc. We spend 90% of our time in closed spaces, so challenging it and controlling the particles suspended inside those spaces is practically indispensable for people suffering from allergies and asthma.